RestFB

RestFB is a simple and flexible Facebook Graph API and Old REST API client written in Java.
It is open source software released under the terms of the MIT License.

http://restfb.com

Facebook Graph API

https://developers.facebook.com/tools/explorer?

Facebook Query Language – FQL Reference

https://developers.facebook.com/docs/reference/fql/

Facebook Likes, Reach and Engagement (FAQ)

https://www.facebook.com/help/355635011174004/

Facebook Developer Documentation

https://developers.facebook.com/docs/

Facebook Technology Partners

https://developers.facebook.com/docs/facebook-technology-partners/

Facebook Data Access – Login, Privacy and Permissions

https://developers.facebook.com/docs/reference/api/data-access/

Facebook Does not Give Access to People who Liked a Page

https://developers.facebook.com/bugs/147185208750426