When someone who is generally disliked by most people, and who is usually physically small or weak, and is not respected by most people in real life, talks trash or attempts to assert his or her authority on Facebook.
Karl: Hey know that kid Josh Witt?
Patrick: Ya, what about him?
Karl: Hes definitley got facebook bravery.
Patrick: Definitley, last night he told me to go fuck myself, but when I saw him today he was all like Hey hows it going?" .