Finding mutual friends on facebook

Question

I want to find out mutual friends between two random users using the facebook Graph API v2.2.

I read through the documentation https://developers.facebook.com/docs/graph

Answer 1

Managed to find a solution and it's working. If you got the call working within you and somebody else and you both are friends on Facebook, what you need to do is create the Appsecret

which represents the App secret key found on Facebook Dev under My Apps and the token. You create this key by running : $appsecret_proof= hash_hmac('sha256', $access_token, $app_secret);

Afterwards you pass the token and the secret as parameters to the call:

Bundle params = new Bundle(); 
params.putString("appsecret_proof", appsecret_proof); 
params.putString("access_token", access_token);