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1.
when someone gratuitously sluts themselves out on facebook.

This is includes but not limited to:

Excessive uploading/tagging/posting of photos
Constantly being on facebook
Frequent useless posts/updates
Kerry: Have you seen Sean lately?
Jimmy: He's busy facehookin, that dude never leaves his room
by tndcrs July 08, 2009
 
2.
To post statuses while under the influence. Also to post incessantly about useless crap for attention.
I was facehookin the other night after a whole 26'r to my head
by chipsahoi August 07, 2011