Facestigating
Using Facebook like a detective to dig up dirt on someone. They look at their posts, photos, friends, and anything else they can find.
'I facestigated him and found out he's a total liar.'
'She facestigated my mom and found out she used to be a cheerleader.'
'He facestigated me and saw I had a tattoo. Now he won't stop asking about it.'