it is a term with many uses, so it is always containing a description of such behavior, with the term being redundantly extra added uselessness jargon spouted by anti-social vapid sociopaths to describe their own actions when performed by others; usually to make it seem as if everyone does this.
that person updates their status from their phone every hour. i swear they do nothing but facefuck their bookspace page all day.
i met this girl online, and i've been trying to meet her but when i call she only responds via text or email. she's probably a nutjob who never meets anyone but facefucks everyone's bookspace page.
i recently saw somebody from high school i barely knew- we weren't even friends but now all he does is facefuck my bookspace page!