How to Log in to Facebook: Simple Steps & Troubleshooting
Help! Fb won't let me log into the app on my phone but I can on my mobile browser. Facebook doesn't offer live help so I can't solve this problem : r/helpdesk
android - Facebook after login not coming back but asking login again - Stack Overflow
Should I Log In With Facebook? - Ask Leo!
android - Facebook login not working with facebook application - Stack Overflow
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Configure Facebook Login on Your Website & Mobile App in 2020