Create an app in facebook developers(the video with steps is in the plugins settings page), add the plugin line to display the button in theme file and you are ready to go.

– login user with facebook account;

– register user with facebook account;

– save user image on server;

– save user image link in database;

– update uer image link from database on each login;

– chose what image dimension to download form facebook;

– synchronize emails if user change the email;

– display user paswords and email after registration;

– display in admin dashboard if user is registr with facebook;

– display facebook id, image and last login with facebook on edit user page from admin;

If we miss something don’t hesitate to contact us.