问题
How to check whether the user likes a facebook page or not in an iPhone app?
I know that I need "user_likes" permission. what else should be done?
回答1:
Actually you can't like a page on Facebook. The best way to achieve that is to load the page inside a uiwebview and later you can check whether the user liked the page or not.
来源：https://stackoverflow.com/questions/15719701/ios-how-to-check-whether-the-user-likes-a-facebook-page-or-not