Facebook tolerates you. It is thanks to them that you remain relevant. E.g., when Facebook Graph Search can't find a particular item, it currently defaults to Bing... but, that can easily change. Please, pretty please, just give them a reason to reconsider their allegiances, and I am sure they will happily discard you like the dead skin off a snake.
Never forget that the enemy of your enemy is your friend. Besides, if Facebook has taught us anything, it's that regardless of who had the idea first, it's execution ultimately that matters. If you have to tell people that you've won, you've lost.