Is it possible to LIKE a Facebook Page via the Open Graph API?
Maybe POST to "http://graph.facebook.com/#{FB_PAGE_ID}/likes ???
This is the only thing I could find in the API about creating a LIKE:
/POST_ID/likes like the given post none
Actually, it's not possible. You can not like pages. Check this: 'Like' a page using Facebook Graph API . I had to use a website to do like a page.
The error I always got was something about permission whitelist. It seems that this specific function is only available for specific apps.
At the top of my head, I think you can get a edge create notification with the javascrip sdk that you can use as callback for adding a fb page