That's no surprising. I already developed a game for Facebook a few years ago and was amazing how many information about the user and his friends was possible t

That's no surprising. I already developed a game for Facebook a few years ago and was amazing how many information about the user and his friends was possible to collect. There were simple no restriction. I try to imagine games like Farmville that were played by millions of people, how many information they collected. Nowadays, Facebook has Graph API. You need to specify exactly what information about the user you want. And depending on the information, Facebook needs to review in advance.