Facestake
When you say yes to a friend request just because you remember them, and then you're reminded why you hated them in the first place.
My old math teacher sent me a friend request. I accepted. Now she's messaging me about algebra.
I accepted my childhood enemy's request. Now she's liking all my photos and commenting on my life.
I took my old crush's request just to be polite. Now he's texting me at 2 a. m.