This video helps you learn how to get data from Facebook using graph api v2.5

Step 1: Create Facebook app using below link 

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

Step 2: Get access token using below link 

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

Programmatically to get lifetime access token: https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token&client_id=client_id&client_secret=secret _key&fb_exchange_token=access_token

Step 3: Retrieve data from Facebook using below link 

https://graph.facebook.com/Page_id/feed?access_token=Access_Token