If someone's blocked me, will I be able to search for them on Steam?
If a player has blocked you, and their profile is still Public, then you can still see their profile. However, if you attempt to add them, then you will get an error message saying that you are unable to add them as a friend. Furthermore, attempts to send communication to them will be cut off, even if you attempt to bypass this by finding a similar group the player who has blocked you is also in, and attempt to chat with them this way.