Attention seeker who periodically (or habitually) deactivates their FB account so as to solicit messages of concern for that person's well being. The Drama Queen will then reactivate their account a week later and accumulate "Welcome Back" and "We were so worried" wall postings.
"Hey, did you notice Joanne's not on FB any longer?"
"Oh, she'll be back. She's nothing but a little Facebook Drama Queen seeking attention."