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."
By Elsbeth
Creepbook
a word used to describe the dark side of facebook where people can basically stalk someone if they really wanted to.
Actively looking through another person's Facebook in order to gain info, spy or to stalk
After a breakup:
ExBF: So I found out you went a date last night...
ExGF: How did you hear that?
ExBF: I saw on your Facebook
ExGF: STOP CREEPBOOKING ME!!!
