That’s really Simple !
I believe that Post will help you a lot !
Just go to Here .
And Then Click ” Login with Facebook” !
And Then Click ” Load Friends” !
Then wait for a while and it will show a text file.
At that moment all you have to do is to select and copy all the text and save as filename.csv and Click ” Import Gmail ” and I would say “Congratulation”.
You have successfully copied all your Facebook Friends to Gmail.
By the way,some say that can be used to know the secret login gmail of the facebook users!
Credit to A Post In That Group