noun/verb: to inspect the Facebook profile of a potential boyfriend, girlfriend, random hookup to see if he/she is in a relationship before proceeding to make advances. This is done to avoid socially making an ass of oneself. Danger: Sometimes, Facebook Checking may open the door for a Facebook Stalker.This is also done to see if the desired person is loose or stuck up.
"I'm glad I decided to Facebook Check that girl I met at the rave last night. Turns out she's a real ho."
"I know a guy that facebook checked a girl he was in love with, now he's a full blown Facebook Stalker."
" That guy from our school I did the Facebook Check on has had like 50 STDs in the past month or so."