This shouldn't be about playing the game or not, it should be about FB integration solely.
And I say HELL NO.
FB already has endless "social" games that spam users with notifications & posts, Pokémon isn't (& will never be) one of those games. Integrating a Pokémon game with FB would only lower the quality of the game & would significantly increase spam posts.
If you really wanna share your progress you can use the Global Link feature which will be integrated in X&Y, I reckon it's going to be like a Pokémon only social network where you'll manually share what you choose only, which includes any pictures taken in-game & statuses made by you, & only Pokémon fans will be able to hear your "news", other people will only consider it spam.