Facebook obligate friend
You get a friend request, and even though you're annoyed, you accept it because you're too weak to refuse and you're too proud to look like a fool.
My gym teacher sent me a friend request. I accepted it because I didn't want to be the kid who ignored their authority.
My uncle sent me a friend request. I accepted it because I felt bad and I didn't want to be called a rude kid.
My mom's best friend sent me a friend request. I accepted it because I was too tired to fight back.