Facebook Background Check
When you hook up with someone online and you want to see if they're a total lunatic before you end up in a crazy relationship or a bad breakup. You check their Facebook to see what kind of trash they post, who they're friends with, and if they have pictures of their exes making out with their dogs.
I checked her Facebook and she has 10 pictures of her ex holding her dog and crying.
His Facebook is full of selfies with his gym buddy and a guy named 'Derek from 2013.'
She's friends with her ex, her ex's ex, and her ex's ex's ex.