What are all the custom URL schemes supported by the Facebook iPhone app?

June 2014 EDIT: Here is the updated list from Facebook v12:

fb://album?id=%@
fb://background_location
fb://browse?semantic=%@&result_type=%d&source_type=%d&title=%@
fb://codegenerator
fb://composer?%@
fb://composer?pagename=%@&pageid=%@
fb://composer?target=%@
fb://composer?view=location
fb://contactimporter/?ci_flow=%d
fb://discovery
fb://entitycards/?ids=%@&source=%@
fb://event?id=%@
fb://event?id=%@&post_id=%@
fb://eventguestlist?event_id=%@
fb://events/list
fb://eventslist?owner_fbid=%@
fb://f(.+)(\?|&)v=map(\&.*)?
fb://f(.+)incorrect_map_pin(\&.*)?
fb://friendsnearby
fb://friendsnearby/?source=%@
fb://friendsnearby/?source=divebar
fb://friendsnearby/ping?fbid=%@&source=%@
fb://friendsnearby/profile?fbid=%@&source=%@
fb://gift?
fb://group?id=%@
fb://group?id=%@&object_id=%@&view=permalink
fb://hashtag/
fb://hashtag/%@
fb://location_settings
fb://messageComposer?
fb://messaging/new
fb://messaging/new?id=%@&name=%@&isPage=%d
fb://messaging?
fb://messaging?id=%@
fb://messaging?id=%@&%@
fb://messaging?tid=%@
fb://messaginglist
fb://page?id=%@
fb://page?id=%@&source=%@&source_id=%@
fb://page_about?id=%@
fb://page_friend_likes_and_visits?id=%@
fb://page_reviews?id=%@
fb://photo?%@
fb://photo?id=%@
fb://pnp?type=instructions
fb://products?%@
fb://profile
fb://profile/%@
fb://profile?id=%@
fb://profile?id=%@&%@=%@
fb://story?%@
fb://story?graphqlid=%@
fb://story?id=%@
fb://timelineappsection?id=%@
fb://topic/%@
fb://uploadcoverphoto
fb://zrnext

April 2013 EDIT : Looks like none of below works anymore with latest versions, facebook app navigation probably has been rewrited. Some reverse engineering to do on latest version...

I guess that might help, that's from v3.4 :

fb://album/%@
fb://album/(aid)
fb://album/(aid)/cover
fb://album/(initWithAID:)
fb://album/(initWithAID:)/cover
fb://album/new
fb://albums
fb://birthdays
fb://birthdays/(initWithMonth:)/(year:)
fb://birthdays/(month)/(year)
fb://chat/(fbid)
fb://chat/(initWithUID:)
fb://chat/(user.fbid)
fb://contactimporter
fb://contactimporter/invites
fb://contactimporter/legalese
fb://contactimporter/modal
fb://event/%@
fb://event/%llu
fb://event/(event.fbid)/members/(rsvpStatus)
fb://event/(fbid)
fb://event/(fbid)/members/attending
fb://event/(fbid)/members/declined
fb://event/(fbid)/members/not_replied
fb://event/(fbid)/members/unsure
fb://event/(fbid)/rsvp
fb://event/(initWithEventId:)
fb://event/(initWithEventId:)/members/(rsvpStatus:)
fb://event/(initWithEventId:)/rsvp
fb://events
fb://events/
fb://faceweb/(initWithURL:)
fb://facewebmodal/(initWithURL:)
fb://feed
fb://feed/%@
fb://feed/(filter.filterKey)
fb://feed/(initWithFilterKey:)
fb://feedfilters
fb://findfriends
fb://findfriends/legalese
fb://findfriends/modal
fb://friends
fb://friends/picker
fb://friends/sync
fb://friends/sync/(removeData:)
fb://friends/sync/disconnect
fb://friends/sync/legalese
fb://group/(fbid)/members
fb://group/(initWithGroupId:)/members
fb://groups
fb://launcher
fb://mailbox
fb://mailbox/(folder)
fb://mailbox/(initWithFolder:)
fb://mailbox/(initWithFolder:)/(tid:)
fb://mailbox/(mailbox.folder)/(tid)
fb://mailbox/compose
fb://mailbox/compose/(fbid)
fb://mailbox/compose/(initWithUID:)
fb://map
fb://messaging
fb://messaging/(folder)
fb://messaging/(initWithFolder:)
fb://messaging/(initWithFolder:)/(tid:)/participants
fb://messaging/(initWithFolder:)/thread?tid=(tid:)
fb://messaging/(mailbox.folder)/(urlEscapedTid)/participants
fb://messaging/(mailbox.folder)/thread?tid=(urlEscapedTid)
fb://messaging/compose
fb://messaging/compose/(fbid)
fb://messaging/compose/(initWithUID:)
fb://messaging/original_message?mid=(commentId)
fb://messaging/original_message?mid=(initWithMessageId:)
fb://nearby
fb://note/%@
fb://note/(initWithNoteId:)
fb://note/(initWithNoteId:)/edit
fb://note/(noteId)
fb://note/(noteId)/edit
fb://note/compose
fb://notes
fb://notifications
fb://online
fb://online#offline
fb://online#online
fb://page/(page.id)
fb://pages
fb://photo/%@/0/%@
fb://photo/(album.user.fbid)/(album.aid)/(pid)
fb://photo/(album.user.fbid)/(album.aid)/(pid)/feedback
fb://photo/(fbid)/profilepic
fb://photo/(initWithProfilePicturesUID:)/profilepic
fb://photo/(initWithUID:)/(aid:)/(pid:)
fb://photo/(initWithUID:)/(aid:)/(pid:)/feedback
fb://photosapp
fb://place/%@
fb://place/(initWithPageId:)
fb://place/(targetId)
fb://place/addfriends
fb://place/addphoto
fb://place/create
fb://places
fb://places/%lld/%lld
fb://places/(initWithCheckinAtPlace:)/(byUser:)
fb://places/legalese/tagged/%lld/%lld
fb://places/legalese/tagged/(initWithTaggedAtPlace:)/(byUser:)
fb://post/%@
fb://post/%@_%@
fb://post/(initWithPostId:)
fb://post/(initWithPostId:)/tagged
fb://post/(postId)
fb://post/(postId)/tagged
fb://post/(postId)/untagSelf
fb://post/(untagSelfFromPostWithId:)/untagSelf
fb://profile
fb://profile/
fb://profile/%@
fb://profile/%lld
fb://profile/(addFan:)/addfan
fb://profile/(fbid)
fb://profile/(fbid)/addfan
fb://profile/(fbid)/addfriend
fb://profile/(fbid)/fanpages
fb://profile/(fbid)/fans
fb://profile/(fbid)/favorite
fb://profile/(fbid)/friends
fb://profile/(fbid)/info
fb://profile/(fbid)/menu
fb://profile/(fbid)/mutualfriends
fb://profile/(fbid)/photos
fb://profile/(fbid)/poke
fb://profile/(fbid)/removefriend
fb://profile/(fbid)/wall
fb://profile/(initWithFBID:)/menu
fb://profile/(initWithFansUID:)/fans
fb://profile/(initWithFriendsUID:)/friends
fb://profile/(initWithInfoUID:)/info
fb://profile/(initWithMutualFriendsUID:)/mutualfriends
fb://profile/(initWithPhotosUID:)/photos
fb://profile/(initWithUID:)
fb://profile/(initWithUID:)/addfriend
fb://profile/(initWithUID:)/fanpages
fb://profile/(initWithUID:)/poke
fb://profile/(initWithUID:)/removefriend
fb://profile/(initWithWallUID:)/wall
fb://profile/(toggleFavorite:)/favorite
fb://profile/(user.fbid)/fans
fb://profile/(user.fbid)/friends
fb://profile/(user.fbid)/mutualfriends
fb://profile/0
fb://publish
fb://publish/mailbox/(initWithFolder:)/(tid:)
fb://publish/mailbox/(mailbox.folder)/(tid)
fb://publish/photo/(album.user.fbid)/(album.aid)/(pid)
fb://publish/photo/(initWithUID:)/(aid:)/(pid:)
fb://publish/post/(initWithPostId:)
fb://publish/post/(postId)
fb://publish/profile/(fbid)
fb://publish/profile/(initWithUID:)
fb://publish/profile/(owner.fbid)
fb://requests
fb://root
fb://upload
fb://upload/%@/album/%lld/%@
fb://upload/%@/checkin/%lld
fb://upload/%@/profile/%lld
fb://upload/(initWithSource:)/album/(uid:)/(aid:)
fb://upload/(initWithSource:)/checkin/(checkinId:)
fb://upload/(initWithSource:)/profile/(uid:)
fb://upload/actions
fb://upload/actions/album/(initWithUID:)/(aid:)
fb://upload/actions/album/(user.fbid)/(aid)
fb://upload/actions/checkin/(checkinId)/
fb://upload/actions/checkin/(initWithCheckinId:)
fb://upload/actions/newalbum
fb://upload/actions/profile/(fbid)
fb://upload/actions/profile/(initWithUID:)
fb://upload/actions/resume
fb://upload/album/(showUploadMenuWithUID:)/(aid:)
fb://upload/album/(user.fbid)/(aid)
fb://upload/checkin/(checkinId)
fb://upload/checkin/(showUploadMenuWithCheckinID:)
fb://upload/discard
fb://upload/profile/(fbid)
fb://upload/profile/(owner.fbid)
fb://upload/profile/(showUploadMenuWithUID:)
fb://upload/resume
fb://userset
fb://video/%@
fb://video/(playVideoWithId:)
fb://video/(videoId)

1. Because the accepted answer is not a CW, I'm adding updates separately.
2. These are taken from Android, but should be the same for iOS.
3. This list has reached the length limitation of a SO post (30k characters), so further updates will be posted in a different medium, specified at a later date.

October 2017 Update (from Facebook Messenger v141.0.0.25.76):

Unless otherwise specified, links below should begin with fb://

fb-service://limit_friend_requests

about
account/recovery
account_settings
account-kit/confirmation_code/?confirmation_code={confirmation_code}
achievements/landing/?achievement_id=%s&source=%s
activitylog
ad_activity
ad_break/admin_preview/?video_id=%s&time_offset=%s
add_address/
add_services
ads/preferences/?tracking=%s
ads_checkout_payment_receipt?account=%s&campaignGroupID=%s&chargeAmount=%s&chargeCurrency=%s&orderNumber=%s&credentialID=%s&timeCreated=%s&withdrawAmount=%s&withdrawCurrency=%s
ads_experience/?id=%s
ads_payments_add_bank_account?account=%s&contextID=%s&originRootTag=%s
ads_payments_add_card?account=%s&contextID=%s&dismissOnCompletion=%s&isCheckout=%s&isPUX=%s
ads_payments_add_card?account=%s&isCheckout=%s&dismissOnCompletion=%s&contextID=%s
ads_payments_add_credit_card?account=%s&contextID=%s&originRootTag=%s&offlineMode=%s&legacyAccountID=%s&country=%s&currency=%s
ads_payments_add_paypal?account=%s&contextID=%s&originRootTag=%s
ads_payments_billing_date?account=%s&contextID=%s&hasIntent=%s
ads_payments_billing_date_saved?account=%s&contextID=%s
ads_payments_brazil_address_info?account=%s&contextID=%s&taxID=%s
ads_payments_brazil_tax_id?account=%s&contextID=%s
ads_payments_checkout?account=%s&page=%s&boostMessage=%s&boostImageURI=%s&boostResultType=%s&boostResultLowerBound=%s&boostResultUpperBound=%s&boostDuration=%s&budgetAmount=%s&budgetCurrency=%s&budgetType=%s&credentialID=%s&cachedCscToken=%s&contextID=%s&campaignGroupID=%s&cardType=%s&cardAssociationImageURL=%s&lastFourDigits=%s&expiryMonth=%s&expiryYear=%s&newEndTime=%s&editTime=%s
ads_payments_checkout?account=%s&page=%s&boostMessage=%s&boostImageURI=%s&boostResultType=%s&boostResultLowerBound=%s&boostResultUpperBound=%s&boostDuration=%s&budgetAmount=%s&budgetCurrency=%s&budgetType=%s&credentialID=%s&cachedCscToken=%s&contextID=%s&cardType=%s&cardAssociationImageURL=%s&lastFourDigits=%s&expiryMonth=%s&expiryYear=%s&campaignGroupID=%s&newEndTime=%s&editTime=%s
ads_payments_checkout_receipt?account=%s&campaignGroupID=%s
ads_payments_country_selector?account=%s&contextID=%s&offlineMode=%s&countryCode=%s&currencyCode=%s
ads_payments_currency_selector?account=%s&contextID=%s&selectedCurrency=%s
ads_payments_direct_debit_country_selector?account=%s&contextID=%s&countryCode=%s
ads_payments_flow?account=%s&contextID=%s&adBudgetAmountInHundredths=%s&adBudgetType=%s&adDuration=%s&adCampaignGroupID=%s&adEditTime=%s&adNewEndTime=%s&offlineMode=%s&legacyAccountID=%s&addPaymentMethodMessage=%s&disableCouponEntry=%s&countryCode=%s&currencyCode=%s&boostAfterComplete=%s&pageID=%s
ads_payments_gst_id?account=%s&contextID=%s
ads_payments_prepay_business_info?account=%s&contextID=%s&originRootTag=%s
ads_payments_prepay_client_info?account=%s&contextID=%s&originRootTag=%s&businessTaxID=%s&businessEuVatTaxCountry=%s&businessName=%s&businessStreet1=%s&businessStreet2=%s&businessCity=%s&businessState=%s&businessZip=%s&businessCountryCode=%s
ads_payments_prepay_disclaimer?account=%s&contextID=%s&originRootTag=%s
ads_payments_prepay_funding?account=%s&contextID=%s&originRootTag=%s
adsmanager/%s/billing/settle
adsmanager/%s/detailed_targeting/%s/%s/%s/%s/%s/%s/%s?isModal=%s
adsmanager/%s/insights/%s
adsmanager/{account}/insights/{adObject}
adsmanager/{account}/insights/{adObject}?account=%s&adObject=%s&editCampaignURI=%s&shouldShowAdHeaderView=%s&adObjectLevel=%s
adsmanager/image/select/%s
adsmanager/image/select/{page}
adsmanager/image/select/{page}?page=%s&cropWidth=%s&cropHeight=%s&minCropWidth=%s&minCropHeight=%s&callbackModule=%s&callbackMethod=%s&imageSourceCategory=%s&isInstagramEnabled=%s&account=%s
albumcreator
albumcreator?featured={is_featured}
albums
albums/%s
albums/%s?tab_to_land=%s
albums_edit_flow
ama?entryPoint=%s&fb_hidesTabBar=%s&presentationMethod=%s&targetURI=%s
ama?entryPoint=%s&targetURI=%s
app_section/%s/%s
appcenter
appcenter/detail?app_id=%s
appfeed
appinvites/
background_location/nux?source=%s&redirect_after_accept=%s&nux_type=%s
background_location/settings
beam/receiver?ssid=%s&code=%s&timestamp=%d
bi_boosted_post_appeal_form/?boost_id={boost_id}
booking_request/create_appointment
booking_request/create_appointment?booking_request_id=%s
bookmarks/
bookmarks_section
boost_event/?page_id=%s&graphql_story_id=%s&promotion_target_id=%s&placement_extra=%s&referral=%s&coupon_promotion_group_id=%s&ad_account_id=%s&scroll_to_section=%s&request_data=%s
boost_post/?page_id=%s&graphql_story_id=%s&referral=%s&coupon_promotion_group_id=%s&ad_account_id=%s&scroll_to_section=%s&request_data=%s
bootcamp/
camera
canvaseditor?canvas=%s&page_id=%s&story=%s&source=%s
casual_groups_tab
cityguides?pageID=%s&pageName=%s&entryPoint=%s
codegenerator
collection/%s/%s/%s
commerce/admin/products/%s/edit
commerce/admin/products/add
commerce/admin/shop/%s/add
commerce/admin/shop/%s/edit
commerce/collectionview/%s
commerce/collectionview/%s?rid=%s&rt=%s&title=%s&hide_page_header=%s
commerce/contact-merchant/dialog?<q$1>
commerce/products/%s
commerce/products/%s?rid=%s&rt=%s&preview_details=%s
commerce/products/<p$1>
commerce/shop/%s
commerce/shop/%s?rid=%s&rt=%s&selected_product_id=%s&hide_page_header=%s
commerce/shop/visual-search/camera
commerce_inventory?groupID=%s
commerce_inventory_comments?storyID=%s
commerce_inventory_cross_post?storyID=%s
component_script_playground
composer
composer?view=live&text={?text}
contextual_profile/{#com.facebook.katana.profile.id}
coverphoto
creatorapp/home/following
cta_promotion?page_id=%s&boost_id=%s&source=%s&referral=%s&restore_saved_settings=%s&coupon_promotion_group_id=%s&ad_account_id=%s&scroll_to_section=%s&request_data=%s
daily_dialogue_weather_permalink
daily_dialogue_weather_permalink?city_id=%s
daily_dialogue_weather_permalink?city_id=%s&orig_src=%s
daily_dialogue_weather_permalink?orig_src=%s
data_savings_mode_settings
data_savings_mode_settings/?source=bar
data_savings_mode_settings/?source=bookmarks
data_savings_upsell
dbl_loggedin_settings
dbl_login_activity
device_requests
dialtone_info_screen
direct_inbox/
direct_viewer/source/{source}
direct_viewer/source/{source}/direct_thread_id/{direct_thread_id}
ditto_timeline/{#com.facebook.katana.profile.id}
donate/?fundraiser_campaign_id=%1$s&action_type=%2$s
donate/?fundraiser_campaign_id=%1$s&post_id=%2$s
donate/?fundraiser_campaign_id=%1$s&post_id=0
donate/?fundraiser_campaign_id=%1$s&source=%2$s
donate?fundraiser_campaign_id=%1$s&source=%2$s
donate_create
donate_create/?force_create_form=true
donate_create/?fundraiser_campaign_id=%1$s&source=%2$s
donate_create/?fundraiser_charity_id=%1$s&source=%2$s
donate_create/?fundraiser_charity_id=%1$s&source=%2$s&promotional_source=%3$s
donate_create/?source=%1$s
donate_guestlist/?fundraiser_campaign_id=%1$s
donate_invite/?fundraiser_campaign_id=%1$s
donate_invite/?fundraiser_campaign_id=%1$s&source=%2$s
donate_invite_new
donate_single_click_invite/?fundraiser_campaign_id=%1$s
donate_single_click_invite/?fundraiser_campaign_id=%1$s&source=%2$s
donate_single_click_invite/?fundraiser_campaign_id=%1$s&source=%2$s&referral_source=%3$s
donate_trigger/?id=%1$s
donate_trigger/?id=%1$s&source=%2$s
editor?entry_point={entry_point}
electionHub
electionHub/?ref=search
event/%s
event/%s/extendedinvite
event/%s/invite
event/%s/invitegroup/%s
event/%s/makeplans?__referral_surface=%s&__referral_mechanism=%s
event/%s/messagefriends/asgroup?__referral_surface=%s&__referral_mechanism=%s
event/%s/messagefriends?__referral_surface=%s&__referral_mechanism=%s
event/{event_id}/messageallfriends?__referral_surface={ref_surface}&__referral_mechanism={ref_mechanism}
event_collection
event_creation
event_creation/%s
event_creation/{#%s}
event_creation/categories
event_creation/details
event_creation/notification?story_cache_id=%s
event_creation/prefill/%s
event_creation?privacy={%s}
event_discovery
event_discovery/filter?title={%s}&suggestion_context={%s}
event_edit
event_stories_review_sheet?eventID={event_id}&bucketID={bucket_id}
events
events/%s/timeslots
events/{%s}/reaction
events/campaign?suggestion_token={suggestion_token}&title={title}&ref_notif_type={ref_notif_type}&ref_surface={ref_surface}&ref_mechanism={ref_mechanism}
events/section?section_name=%s
explore/
facecast_integrated_sharesheet/
facecast_sharesheet/
facerec_enrollment_setting
facerec_settings
faceweb/f?href=
faceweb/f?href=%%2Fprofile.php?v=info%%26id=%s
faceweb/f?href=%2Ffriends%2Fcenter%2Ffriends%2F
faceweb/f?href=%2Fhelp%2Fwork
faceweb/f?href=%2Fmessages?src=fb4a
faceweb/f?href=%2Fnearby_info%2Fmanage_hidden_pages
faceweb/f?href=%2Fonavo/promotion/install
faceweb/f?href=%2Fprivacy
faceweb/f?href=%2Fprivacy%2Ftouch%2Ftimeline_and_tagging
faceweb/f?href=%2Fsaved
faceweb/f?href=%s
faceweb/f?href=%s&force_faceweb=true
faceweb/f?href=//settings/location/learnmore
faceweb/f?href=/ads/manager
faceweb/f?href=/commerce/contact-merchant/dialog/?product_item_id=%s
faceweb/f?href=/coupons/info/?coupon_id=%s
faceweb/f?href=/event/%s/madminpanel/pending
faceweb/f?href=/groups
faceweb/f?href=/instant_article/publisher_ad_about
faceweb/f?href=/media/set/?set=ft.%s
faceweb/f?href=/pages/create/?ref_type=android_timeline
faceweb/f?href=/pages/messaging/action/compose/?post_id=%s
faceweb/f?href=/pages/place_claim/entry_redirect/?page_id=%s
faceweb/f?href=/profile/intro/edit/about
faceweb/f?href=/profile/intro/edit/links
faceweb/f?href=/settings/email
faceweb/f?href=/timeline/friend_list_view/?profile_id=%s
faceweb/f?href=https://m.facebook.com/jobs?source=%s
faceweb/f?href=https://m.facebook.com/onthisday/notification/settings/?source=permalink
faceweb/f?href=https://m.facebook.com/onthisday/preferences/?source=permalink
faceweb/f?href=https://m.facebook.com/order_tracking
faceweb/f?href=https://m.facebook.com/work/terms/nav
facewebmodal/f?href=%s
family_nav_instagram_install
fb_photos_picker
fb_photos_picker/?campaign=%s
feed
feed_awesomizer
feed_awesomizer/connections
feed_awesomizer/following
feed_awesomizer/see_first
feed_awesomizer/unfollowed
feed_switcher?switcher_item_id={%s}
findfriends/learn_more
findfriends?ci_flow=%s
findfriends?ci_flow=%s&ccu_ref=%s&force_show_legal_screen=true
findfriends?ci_flow=%s&force_show_legal_screen=true
findwifi
findwifi_nux
findwifi_settings
flex_dsm_settings
free_fb_invite
friending_possibilities?location=%s
friendlist/%s
friends/
friends/center?source_ref=%s
friends/center?source_ref=%s&fc_tab=%s
friends/center?source_ref=%s&fc_tab=requests&user_id=%s&name=%s&profile_pic=%s&attachment=%s
friends/new_user_promotion
friends/requests/
friends/requests_tab
friendship/%s/%s
friendsnearby/profile?fbid=%s&source=%s&notif_id=%s
friendsnearby?source=%s
friendsnearby_invite?selected=%s&excluded=%s
fullscreen_video/{video_id}?loop={loop}
fullscreen_video_redirect/{%s}
fullscreen_video_redirect/{%s}?threadid={%s}
fundraiser_beneficiary_other_input
fundraiser_beneficiary_search/?launch_state=%1$s&beneficiary_type=%2$s
fundraiser_beneficiary_search/?launch_state=%1$s&beneficiary_type=%2$s&source=%3$s
fundraiser_category_selector
fundraiser_country_selector
fundraiser_creation_suggested_cover_photo
fundraiser_currency_selector
fundraiser_submitted/?fundraiser_campaign_id=%1$s&is_p4p=%2$s
fundraisers_shell/?targetURI=%1$s
getgames
getquote/%s/form_builder
gift/receive?gid=%s
gltf_fullscreen
graph_editor?entry_point={entry_point}
group/%s
group/%s/?group_tip_id=%s
group/%s?group_view_referrer=%s
group_commerce_bookmark_category_feed_route?referralSurface+%s
group_commerce_bookmark_category_route?referralSurface=%s&categoryId=%s
group_commerce_bookmark_route?referralSurface=%s
group_commerce_message_seller_route?groupCommerceProductItemID=%s
groups/chats
groups/chats/%s
groups/create
groups/create?ref=%s
groups/createtab
groups/discover
groups/discover/categories
groups/discover/category?id={%s}
groups/discover/tag?id=%s
groups/events/{%s}
groups/gridtab
groups/link
groups/members/{%s}
groups/photos/{%s}
groups/questionnaire/%s
groups/suggestions?source=%s
groups_discovery
groups_targeted_tab
gv_editor?campaign_id=%s&campaign_type=%s&editor_type=%s&initial_source=%s&direct_source=%s
gv_share/?campaign_id=%s&campaign_type=%s&initial_source=%s&direct_source=%s&share_preview=%s&share_preview_title=%s
gv_share/?campaign_id=%s&campaign_type=%s&initial_source=%s&direct_source=%s&share_preview=%s&share_preview_title=%s&share_autofill=%s
hashtag/%s?name=%s&id=%s
help
hyperlocal_discovery?place_id={place_id}&trigger_type={trigger_type}
id_backed_privacy_checkup_react/?checkup_id=%s
ig_sign_up_creation
immersive_capture_sharesheet/
inspiration_settings/
inspirationscamera/?effectID={?effect_id}&reason={?reason}&shareActorID={?share_actor_id}&shareTargetID={?share_target_id}&shouldDisplayCameraRollEffectTooltip={?should_display_camera_roll_effect_tooltip}&categoryID={?category_id}&inspiration_post_action={?inspiration_post_action}&cameraFlow={?camera_flow}
instagram_ci_sso?entry_point={entry_point}
instant_articles
instant_shopping_catalog/?catalog_id={%s -1}&catalog_view={%s -1}&product_id={%s -1}&product_view={%s -1}
invite_coworker
jobApplication?job_opening_id=%s
jobApplication?job_opening_id=%s&source=%s
jobApplication?job_opening_id=%s&source=%s&waterfall_session_id=%s
jobApplicationForm?job_opening_id=%s
jobATSApplication?job_application_id=%s&source=%s
jobOpeningATSRoute?job_opening_id=%s&source=%s
jobSearch
jobSearch?pinned_job_opening_id=%s&source=%s
jobSearch?source=%s
jobSearch?waterfall_session_id=%s&source=%s
language_in_videos_picker
language_switch
lead_gen/?lead_gen_data_id=%s
leadgen?formID=%s&adID=%s&app=%s&mediaID=%s&actorID=%s&trackingToken=%s&brandingImageURI=%s&relayFunnelTag=%s&dynamicItemID=%s
legacy_contact/%s
legacy_contact/%s/cover_photo/
legacy_contact/%s/friend_requests/
legacy_contact/%s/profile_picture/
lh_prompt
lifebalance
link_fb_invite
local_awareness_promotion/?page_id=%s&boost_id=%s&source=%s&referral=%s&restore_saved_settings=%s&coupon_promotion_group_id=%s&ad_account_id=%s&scroll_to_section=%s&request_data=%s
localsell_home/?tabIndex=%s&referralSurface=%s
location_settings
location_timeline
location_timeline_nux
logged_out_push_interstitial
loginapprovalspush
loyalty_add_point_or_redeem
loyalty_admin_phone_number_qr_code_selection?programID={programID}&programTitle={programTitle}
loyalty_admin_result
loyalty_admin_status?pageID={pageID}
loyalty_home?referrer=bookmarks
loyalty_kiosk
ls_prompt
maps
marketplace
marketplace?referralSurface=%s
marketplace_buy_sell_group_home
marketplace_category_deep_link
marketplace_category_menu
marketplace_category_search
marketplace_composer/?assetIDs=%s&defaultCategoryID=%s
marketplace_crosspost
marketplace_debug_info_details
marketplace_drafts
marketplace_editcomposer/?storyID=%s&referralSurface=%s&isDraft=%s
marketplace_forsalegroupshome
marketplace_forsalegroupshome_story
marketplace_home
marketplace_inactive_items
marketplace_initial_message
marketplace_location
marketplace_message
marketplace_message/?threadID=%s&referralSurface=%s
marketplace_multi_theme_feed
marketplace_notification_settings
marketplace_notifications
marketplace_photo_chooser_composer
marketplace_product_details
marketplace_product_details?id=%s&referralSurface=%s
marketplace_product_details_from_post_id?post_id=%s
marketplace_product_message_threads
marketplace_product_message_threads/?productTitle=%s&productID=%s&referralSurface=%s
marketplace_profile?id=%s
marketplace_saved
marketplace_saved_search_results
marketplace_search
marketplace_search?query=%s&referralSurface=%s
marketplace_seller_item_details
marketplace_seller_item_details/?productTitle=%s&forSaleItemID=%s&referralSurface=%s
marketplace_shops?refID=%s&refType=%s&categoryIDs=%s&browseContext=%s
marketplace_theme_feed
marketplace_top_sellers
marketplace_your_items
mediaset/brpi.%s
mediaset/brpo.%s
mentorship_expectation?memberId=%s&groupId=%s&programId=%s&role=%s
mentorship_home
mentorship_meet_mentee?memberId=%s&groupId=%s&programId=%s&role=%s
mentorship_welcome?memberId=%s&groupId=%s&programId=%s&role=%s
menu_management?page_id=%s
merchant_onboarding_currency?refID=%s&refType=%s&paymentProvider=%s&pageID=%s
merchant_onboarding_shop_type?refID=%s&refType=%s&pageID=%s
merchant_onboarding_terms?refID=%s&refType=%s&pageID=%s
messaging
messaging/
messaging/%s
messaging/active_now/
messaging/compose/
messaging/compose/%s
messaging/compose/new
messaging/compose/new/group
messaging/groupthreadfbid/
messaging/groupthreadfbid/%s
messaging/thread/thread?id=
messaging/thread/thread?id=%s
messaging_lite
messaging_tab
messaging_threadlist
mobileconfigrnconfigparams?title=%s&overridden=%s
mobileconfigrnparamoverride?configName=%s&title=%s
mobileconfigrntroubleshooting?configName=%s&title=%s
mobileconfigrnui
mobileconfigrnvalue
movies_theater_select_flow?movie_flow_service_config_id=%s&movie_event_external_movie_id=%s
movieshome
native_album/%s
native_article?article={%s}
native_article?article={%s}&canonical={%s}
native_article?article={%s}&canonical={%s}&saved={%s}
native_article?article={%s}&canonical={%s}&saved={%s}&featured={%s}
native_document/?id={%s -1}
native_post/%s
native_post/%s?fallback_url=%s
native_post/%s?story_cache_id=%s
native_template_shell/?id=throwback/camera/preference?device_id=%s&analytics=throwback/camera/preference
nativename
nearby
nearby/search
nearby/subcategory
nearbyInfoSettings
neo/fallback
neo/fallback?target=friending
neo/fallback?target=hub
neo/fallback?target=profile
neo_friending
neo_hub
neo_profile
neo_profile?fbid=%s&referrer=%s
newContactPoint
nfx?object_id=%s
nfx?object_id=%s&location=%s
note/%s
notification_settings
notification_settings_add_contact_point?contact_type={contact_type}
notification_settings_alerts
notification_settings_confirm_contact_point
notification_settings_email
notification_settings_phone_number
notification_settings_push_and_sounds
notifications
notifications_friending
notifications_griffin
notifications_tab
now/
nux/profile_picture?external_photo_source=%s
offers/barcode_fullscreen/?title=%s&extra_image_url=%s
offers/detail/?coupon_id=%s
offers/detail/view/?offer_view_id=%s&share_id=%s&redirect=%s
offers/detail/view/?offer_view_id=%s&share_id=%s&redirect=%s&offer_should_claim=%s&offer_location=%s
offers/wallet
offlinefeed
onavo_protect_interstitial
online
onthisday?source=%s
onthisday?source=%s&campaign_id=%s&story_id=%s
order_food_see_all
page/%s
page/%s/admin_feed
page/%s/admin_stories
page/%s/album_list
page/%s/book_appointment?referrer=%s
page/%s/book_appointment?referrer=%s&service_id=%s
page/%s/call_to_action
page/%s/child_locations
page/%s/clips
page/%s/community
page/%s/config_call_to_action/%s?ref=%s
page/%s/configure_action
page/%s/episodes
page/%s/events_list
page/%s/get_quote
page/%s/info
page/%s/insights
page/%s/invite_friends_to_like_page
page/%s/jobs
page/%s/offers
page/%s/pendingedits
page/%s/playlists
page/%s/reaction
page/%s/recommendations
page/%s/residence
page/%s/service/%s
page/%s/services_list
page/%s/services_list?entry_point=%s
page/%s/share_as_message
page/%s/suggestedit?entry_point=%s
page/%s/videohub
page/%s/videolist?page_id=%s&source=%s
page/%s/vistor_posts
page/%s?referrer=%s&admin_guidance_type=%s
page/{#arg_page_id}/call_to_action/{arg_page_call_to_action_id}?action_channel_type={arg_action_channel_type}&action_type={arg_action_type}&action_position={#arg_action_position}&page_call_to_action_ref={?arg_page_call_to_action_ref}&page_view_ref={?arg_page_view_ref}
page/{%s}/tab/{%s}
page/appointment_calendar
page/appointment_calendar?referrer=settings
page/calendar_setting_host
page/comparison?comparison_card_type={arg_comparison_card_type}&placelist_id={arg_placelist_id}&page_id={arg_page_id}&comment_graphql_id={arg_comment_graphql_id}
page/consumer_appointment_detail?appointment_id=%s
page/create_new_page/?ref=%s
page/deeplink/%s/tab/%s
page/message_settings?type=all&ref=%s
page/message_settings?type=follow_up&ref=%s&should_enable=%s
page/message_settings?type=reminder_message&ref=%s
page/messages/%s
page/service_selector
page/services_messagner_appointments_cta_creation?page_id=%s
page/video_type
page/videolist?page_id=%s&source=%s
page/videolist?page_id={%s}&source={%s}
page/voice_switcher
page_admin_appointment_request_detail
page_like_promotion/?page_id=%s&boost_id=%s&source=%s&referral=%s&restore_saved_settings=%s&coupon_promotion_group_id=%s&ad_account_id=%s&scroll_to_section=%s&request_data=%s
page_link_menu_management?page_id=%s
page_locations_map/?page_id={page_id}&page_name={page_name}&latitude={?latitude}&longitude={?longitude}&locations_count={locations_count}
pages
pages/%s/enable_server_calendar_export?provider=%s&ref=%s
pages/%s/upsell_calendar_export?booking_request_id=%s&calendar_status=%s&ref=%s
pages/?category=%s
pages/create
pages/launchpoint
pages/messaging/private_reply/dialog/%s/%s
pagesadminhelp
pagesadminlaunchpoint
pagestab
payment_settings
payment_settings_rn
photo/%s
photo/%s/?set=%s
photo_checkup/?source=%s&checkup_type=%s
photo_menu/?page_id=%s
photo_menu/add/?page_id=%s
photosbycategory/?page_id=%s
pivhelp
place/creation
place_visit_question/help
placefeed?placeid=%s&surface=%s&placename=%s
placefeed?placeid=%s&surface=%s&placename=%s&wildcard=%s
platform_first_party
platform_first_party?cta_id=%s
platform_first_party?id={%s}&cta_id={%s}&referrer={%s}&initial_input={%s}
playground_story_embedding?storyID=%s&title=%s
playground_story_embedding_list
policies
privacy_blocking/
privacy_blocking_search/
privacy_checkup/?source=%s
privacy_composer_privacy_options/
privacy_composer_redirect_route/
privacy_enable_public_privacy_options_for_minor/
privacy_follow_privacy_options/
privacy_friend_requests_privacy_options/
privacy_friends_list_privacy_options/
privacy_limit_old_posts_privacy/
privacy_public_search/
privacy_public_search_redesign/
privacy_review_lightweight/?checkup_type=%s
privacy_search_by_email_privacy_options/
privacy_search_by_phone_privacy_options/
privacy_shortcuts/
privacy_timeline_and_tagging_content_visibility/
privacy_timeline_and_tagging_others_content_visibility/
privacy_timeline_and_tagging_settings/
privacy_timeline_and_tagging_settings_can_post/
privacy_timeline_and_tagging_settings_tag_expansion/
privacy_timeline_and_tagging_settings_tag_suggestion/
privacy_timeline_and_tagging_settings_toggle_tag_review/
privacy_timeline_and_tagging_settings_toggle_timeline_review/
privacy_touch_basic/
privacy_touch_basic_redesign/
professionalratertool
profile
profile/%s
profile/%s/activitylog
profile/%s/activitylog_search
profile/%s/activitylog_search/%s
profile/%s/friends/%s?source_ref=%s
profile/%s/info/inner
profile/%s?skip_popup=true
profile/%s?viewas=%s
profile/?extra_launch_profile_photo_selector=true
profile/?extra_launch_profile_status_edit_flow=true
profile/?profile_type=person&intro_card=edit_featured_photos
profile/fun_facts
profile/fun_facts/container_view/?profile_id=%s
profile/fun_facts/manage_prompt_view
profile/info_request/%s/%s
profile/manage_posts
profile/single_fun_fact
profile?frame_id={%s}&entry_point={%s}
profile_about?profileID=%s
profile_edit
profile_insight?id=%s
profilediscovery
profilediscovery?bucketid=%s
profilediscovery?referral_type=%s&referral_id=%s
profilediscovery?referral_type=%s&referral_id=%s&bucketid=%s
profilediscoveryfeed
profileintentdashboard
profilepictureupload
prompt/{%s}invite
qp/%s
qp/%s?data=%s
qrcode
rapid_reporting?object_id=%s
rapid_reporting?object_id=%s&location=%s
reaction-demo
registration
retail_product?product_id=%s&page_set_id=%s&ad_id=%s&ref_id=%s
retail_product?product_id=<p$1>&page_set_id=0&ad_id=0&ref_id=deeplink
reviews/?page_id=%s
reviews/?review_id=%s
reviews/?user_id=%s
rnfiddle
rnotasettings
rnregisteredroutes
rtccall/audio/
rtccall/audio/%s
salegroups
sales_promo_details/?sales_promo_id=%s
samplernintegration
saved
saved/?section_name=%s&referer=%s
saved/list/create/
saved/list/create/?surface=%s&item_id=%s
saved/list/create/?surface=%s&story_id=%s
saved/list/create/?surface=%s&url=%s
search_typeahead_results/?module=%s
search_typeahead_results/?module=%s&initial_query=%s
security_settings
seen_content/
server_snapshot_tests?q=%s&testModuleName=%s&testName=%s
settings
shops?refID=%s&refType=%s&feedType=%s
shops_feed_categories_list?refID=%s&refType=%s
shops_feed_search_route?query=%s&refID=%s&refType=%s
shops_feed_unfinished_purchase_list?refID=%s&refType=%s
shops_product_details?productID=%s&refID=%s&refType=%s&imageSizing=%s&contextID=%s&styleType=%s
silvertailsampleapp
simplestoryapp
simplestoryapp?story_id=%s
snacks_profile/bucket_id/{bucket_id}/story_id/{story_id}
snacks_sharesheet/
socialwifi/?gateway_id=%s
sports/%s
stonehenge_subscription_flow
store_locator/?north={north}&west={west}&south={south}&east={east}&ad_id={?ad_id}&page_set_id={?page_set_id}&parent_page_id={?parent_page_id}
story/%s/%s
story_privacy/
storygallerysurvey/bakeoff
storygallerysurvey/default
storyviewer/bucket_id/{bucket_id}/story_id/{story_id}
structured_menu/?page_id=%s
subscription
support
support_item?id=%s
tarot/chained_digests/?digest_ids={%s}
TEMPLATE_INSTAGRAM_USERNAME_SIGN_UP_PAGE_URL
timeline_review?highlight=<q$1>
top_live
top_live_videos
topic/%s
trust/afro/?hideable_token=%s&story_graphql_token=%s&initial_action=%s&story_location=%s&tracking=%s
trust/afro/?reportable_ent_graphql_id=%s&initial_action=%s&story_location=%s
trust/afro/?reportable_ent_token=%s&initial_action=%s&story_location=%s
video/%s?source_url=%s
video/?href={href}
video/?id={%s}
video/{%s}?source_url={href}
video_home/
video_insight?id=%s
video_notification/?notif_id={%s}&notif_cache_id={%s}
video_notification/?videoid={%s}&threadid={%s}
videochannel?id=%s
watch
watch/watchlist
weather_add_city
website_promotion/?page_id=%s&boost_id=%s&source=%s&referral=%s&restore_saved_settings=%s&coupon_promotion_group_id=%s&ad_account_id=%s&scroll_to_section=%s&request_data=%s
webview/?url=%s
work_contact_invite
work_contact_invite/?group_id=%s
work_contacts_tab
work_groups_tab
workplace_gysj
workplace_pysf
workplace_remind_unclaimed/?user_id={user_id}&name={name}
zero_dialog

The above is taken from the class com.facebook.common.fblinks.FBLinks.

I had a requirement where the client wanted the Social Share buttons on the website to open Facebook and Messenger native apps only. Messenger share is straightforward and documented.

For Facebook, this is a workaround that I used (Tested on Android).

fb://faceweb/f?href=https%3A%2F%2Fm.facebook.com%2Fsharer.php%3Fu%3Dhttp%3A%2F%2Fwww.google.com


fb://faceweb/f?href={{urlencoded sharer.php url}}