How to obtain facebook API Details
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1.) Go to developers.facebook.com
2.) Create a new APP
3.) In settings page , add a OAuth redirect URI to yourwebsite.com/social_login/facebook 
4.) Find your APP ID and APP secret and save them in yourwebsite.com/administrator/component/SocialLogin 


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1. https://developers.google.com/identity/sign-in/web/sign-in
