Facebook Phantom
A Facebook Phantom is someone who’s always online but acts like they’re not. They post statuses, take quizzes, and comment on your wall, but when you try to chat with them, they vanish like a fart in a wind tunnel.
You message your crush, but they say they're offline, even though they just posted a funny meme.
Your friend is taking a quiz about your life, but you can't get a response.
Your mom is online, but she says she's offline because she's 'doing laundry'.