There could be many reasons behind someone not being able to log in to Facebook, such as a faulty Internet connection, a problem with his or her account or an internal issue with the Facebook website's system. Facebook users should always make sure they have the right login information and that their Internet connection is working properly.
Facebook users' accounts can get hacked, such as their password being changed without them even knowing it until the next time they log on. To fix this, users can request a password change and make up a new password that is much stronger than the last one they used. If someone is still having trouble logging into his or her connect, and the Internet connection is working normally, the user can file a report with the Facebook website's help center to get further assistance.
There are many other problems that Facebook users can have when trying to use Facebook. People who have trouble signing in with a mobile number should make sure they are entering the entire phone number correctly with the proper country code.
Users accessing Facebook via Internet Explorer may have issues because of their browser settings. To change the settings, users should go to the "Tools" drop-down menu and select "Internet options," then clicking on the "security" tab and then the "Custom Level" button. They should then select "User Authentication," selecting the option for "automatic login with current username and password."
Some users may be able to log in to Facebook, but be bothered with messages telling them to scan their computer with antivirus software. They are likely receiving this message because the Facebook system has detected malware posting spam content from their computer.