nr: #1 dodano: 2017-01-03 15:01
According to the platform policy, it is not allowed - you can´t reward users in any way for liking. Or for making their friends like something. Users can´t benefit from sharing something on their wall.
Only incentivize a person to log into your app, enter a promotion on your app’s Page, or check-in at a place. Don’t incentivize other actions.
Source: https://developers.facebook.com/policy/ (4.5)
Even if it would be allowed, you would need access to the user feed with the
user_posts permission. Facebook will never approve it in the Login Review for something that is not allowed.