Don't forget gaming back in the day! Facebook games started taking off, then Facebook decided that the _only_ way you could get paid on the Facebook platform was with Facebook Credits, and to incentivize Facebook as the gaming platform of choice, Facebook would give out free Credits to players to spend on Facebook games. Of course, if your game was the one they chose to spend those Credits on, you wouldn't actually get paid, not with promotional credits, what, are you crazy?

No, I'm not still bitter from that era, why do you ask?