To know if someone blocked you on Facebook, check a few signs. First, search their name if their profile doesn’t appear but you can still see it from another account or browser, you may be blocked. You also won’t be able to view their profile, send messages, or see old conversations; their name may appear as “Facebook User.” If you were friends, they will disappear from your friends list and you won’t see their posts or comments anywhere. These signs together usually mean you’ve been blocked, but the account could also be deactivated, so check carefully.