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If you suspect that your Facebook account has been compromised, you need to change your password immediately. If you use Facebook as a login to apps such as Spotify or Instagram then change the logins. This will prevent the hacker from gaining access to these third-party services through your hacked Facebook account.
A compromised Facebook account can offer hackers access to a wealth of personal information. Hackers can make use of this information for nefarious reasons like contacting people or sending fake credit card offers. They can also use the compromised account to send spam messages to friends, or even publish on your timeline using your name (as if you did it yourself).
Hackers are more likely to gain access to accounts by exploiting a flaw within the Facebook app’s code. A bug in the iOS Facebook app allows hackers to steal cookies, and then steal the “access token” of an iPhone user. These tokens are digital keys, allow them complete control over the user’s Facebook Account, and any other website they sign into using their Facebook credentials.
A hacker can also gain access to an account by using brute force attacks. This method involves figuring out passwords, usually the most popular ones such as 1234567890 or 123456789. Hackers may also gain access to accounts by scanning compromised credentials. There are many free tools that can be used to search for stolen data, such as the popular website HaveIBeenPwned.