facebait
Posting on someone's wall just to get them to come online, usually because you're trying to chat with them and don’t want to look like you're trying too hard.
You post 'Hey, I saw you're offline.', and then you vanish.
You write 'I wonder what you're up to.', and then you go to sleep.
You post 'Hey, I miss you.', and then you delete it.