IMPORTANT!!!!
OAuth Client Verification
Starting July 18, 2017, Google OAuth clients that request certain sensitive OAuth scopes will be subject to review by Google.
see more https://developers.google.com/apps-script/guides/client-verification
Introduction
Nowadays, popular web services support quick social login and registration. Your website needs to create private project application to get ID key and secret code for social networks interaction.
How To Create OAuth Google Login Application