a person who spends large amounts of time on facebook looking at other people's profiles. often browsing photos, walls (or wall-to-walls), groups, or recent activity posted on the stalked person's mini-feed.
"you are such a facebook stalker!"
"i found out that sarah joined a group when i was facebook stalking her last night."
"mikey is so hot, i think i'm gonna spend most of the night facebook stalking him looking at his pics."
"did you see emily and jenny's wall-to-wall? they were totally talking about you behind your back!"