How can we track hashtags with the new facebook hashtag implementation

Solution 1:

There is currently no API for the hashtags feature on Facebook

edit: there was however a public posts search function which will return some public posts with a certain hashtag if you use that hashtag as the search string in API version 1.0 - there is no equivalent in version 2.0 onwards

It ignores the # symbol in the matching though, so a search for '#omg' will find posts with 'omg' too.

See https://developers.facebook.com/docs/graph-api/using-graph-api/v1.0#search )

Solution 2:

Facebook recently announced new tools for surfacing conversations with the launch of Public Feed API which :

displays a real-time feed of public posts for a specific word

Unfortunately, that tool is restricted to a small set of "trusted" users for now...