leave Facebook and face your book
A pun used by boomers, e.g parents or teachers, when they want to encourage a kid to study while trying to be hip and trendy despite Facebook being an irrelevant website today.
Kid: *is playing a mobile game*
Boomer: leave Facebook and face your book!
Kid: I'm not even on Facebook wth
Boomer: leave Facebook and face your book!
Kid: I'm not even on Facebook wth