Creeper

A random person who stands out in the background of a picture but went unnoticed at the time the picture was taken. The person either intentionally or unintentionally invades a picture by posing in a ridiculous manner.

Who was that creeper trying to lick your face in our picture?!?

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creepbook

Perusal of a facebook "friend's" photos in an effort to catch-up on their lives...usually because communication with that "friend" hasn't occurred for a substantial period of time.

"Have you talked to Catherine lately?"
"No but I creepbooked her photos and I think she's moving out of her apartment soon."