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https://stackoverflow.com/questions/37953784/rails-facebook-oauth-get-user-profile-link
https://gorails.com/forum/facebook-profile-image-data-using-devise-in-rails
https://www.reddit.com/r/rails/comments/4l2yyt/omniauth_facebook_profile_photo/
https://developers.facebook.com/docs/graph-api/reference/user/picture/?locale=de_DE
https://revs.runtime-revolution.com/working-with-facebook-using-devise-omniauth-koala-and-rails-5-cde5d032de02
https://medium.com/@chinnatiptaemkaeo/integrate-omniauth-facebook-to-rails-5-1389d760d92a
https://launchschool.com/blog/facebook-graph-api-using-omniauth-facebook-and-koala
http://www.steveschofield.tech/techbiz/2014/1/21/using-omniauth-facebook-profile-image-with-carrierwave-in-rails-4
https://www.nascenia.com/integration-of-facebook-graph-api-in-rails-application/
http://railscasts.com/episodes/361-facebook-graph-api?view=asciicast
https://auth0.com/docs/users/guides/change-user-pictures
https://code.i-harness.com/en/q/a0b649
https://ping.force.com/Support/How-to-retrieve-the-Facebook-Profile-Picture-URL