Facejoke
You post a fake story or joke on your Facebook and your friends believe it and start telling other people like it's real.
'I'm adopted by aliens.', 4 likes from my neighbors who think I'm a robot.
'I'm a wizard.', 1 like from my brother who still believes in Harry Potter.
'I'm going to be president.', 2 likes from my mom who thinks I'm already a king.