Looking for logging into the Facebook App Sign Up 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 App Sign Up site. After that you can login as usual with your login credentials.
https://www.facebook.com/r.php
https://touch.facebook.com/
https://developers.facebook.com/docs/facebook-login/multiple-providers/
https://developers.facebook.com/docs/apps/
https://developers.facebook.com/docs/facebook-login/
https://www.facebook.com/help/188157731232424?helpref=topq
https://www.oreilly.com/library/view/fbml-essentials/9780596519186/ch01s02.html
https://help.instagram.com/155940534568753
https://stackoverflow.com/questions/13195556/is-it-possible-to-signup-in-facebook-without-an-email-id
https://www.thebalancecareers.com/how-to-customize-a-business-page-on-facebook-3515573
https://help.aweber.com/hc/en-us/articles/204027926-How-do-I-add-a-Sign-Up-Form-to-my-Facebook-page-
https://help.soundcloud.com/hc/en-us/articles/115003449207-I-want-to-sign-in-to-my-account-without-Facebook-or-Google-
https://help.line.me/line/?contentId=20000107