Facebook exhibitionist
A person who can't keep their feelings to themselves, so they post them everywhere like a loudmouth. It's either for attention or to rub everyone else's nose in it.
'She's my everything!', posted on his girlfriend's wall during a boring meeting.
'He’s the best friend I’ve ever had!', said by his boyfriend on Facebook during a class project.
'They’re perfect together, and I’m just here to watch them shine.', said by a friend who’s clearly jealous and wants to die.