Get the fuck off Facebook. Gtfofb Can be used in multiple contexts. You can say it to someone who is on Facebook but should be studying, or you can say it to someone who has no business being on Facebook such as a 7 year old or a Twilight fan.
Bob- I should def be studying for my final
Tom- Then gtfofb ya douche
Sally- I love Justin Bieber, Barbies and Twilight!
Jose- Gtfofb you 7 year old
When the person who lived in your apartment before you moved in keeps the key then comes back shortly after you move in and steals small items of seemingly little consequence such as a pair of socks, camera memory card, package of hotdogs, or a pocket knife when plenty of things of much greater value are lying around. They may also leave a telltale sign that something is amiss such as leaving the light switch on, but turning the lamp off.
Aaron: Hey, Emily, were you in my room at all today?
Emily: Nope, why?
Aaron: Cuz someone turned off my lamp, but not the light and my camera memory cards are missing.
Emily: Darn previous tenant mischief