Looking for logging into the Facebook As Different User site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Facebook As Different User site. After that you can login as usual with your login credentials.
https://www.facebook.com/notes/facebook/log-in-with-your-facebook-username/138003612130/
https://www.quora.com/How-do-you-login-a-different-user-on-Facebook
https://meta.stackexchange.com/questions/231929/login-with-facebook-creates-different-user
https://stackoverflow.com/questions/5804761/how-can-i-login-as-a-different-user-in-facebook-login-dialog
https://www.drupal.org/project/fboauth/issues/2117241
https://help.getmevo.com/hc/en-us/articles/360002067947-Log-into-a-Different-Facebook-Account
https://medium.com/@taylorhughes/the-unexpected-costs-of-third-party-login-cda41c087653
https://community.spotify.com/t5/Accounts/How-do-i-find-my-username-when-using-Facebook-login/td-p/859795
https://help.soundcloud.com/hc/en-us/articles/115003449207-I-want-to-sign-in-to-my-account-without-Facebook-or-Google-
https://support.strava.com/hc/en-us/articles/216942767-How-to-switch-from-a-Facebook-login-to-email-login
https://www.scienceabc.com/innovation/oauth-how-does-login-with-facebook-google-work.html
https://www.typeform.com/help/login-issues/
https://www.twilio.com/blog/add-facebook-twitter-github-login-laravel-socialite