when two people flirt on facebook, and it's obvious that they like each other
Girl 1: I don't know how Manny feels about me.
Girl 2: It's pretty facebook obvious that he likes you.
Girl 1: What does that even mean?
Girl2: It means that he is always flirting with you on facebook.
When something is not said but known to be true via FB
What happened to you and your dude? Y'all broke up?
We haven't told anyone. How did you know?
It was Facebook obvious