If you suspect that your Facebook best site account has been compromised, you need to change your password immediately. Then, if you use Facebook for logging into apps like Spotify or Instagram, change those logins too. This will stop the hacker from gaining access to these third-party services via your compromised Facebook account.
A compromised Facebook account can give hackers an unending supply of personal information. Hackers can make use of this information for nefarious purposes, like taking credit card numbers or spamming people with fake credit card offers or scams that involve phishing. Hackers may also use hacked accounts to send spammy messages or post on your timeline (as the case were you who did it).
One of the most common ways hackers can gain access to an account is to exploit a flaw in Facebook’s app code. For instance, a vulnerability in iOS’s Facebook application allowed hackers to steal cookies and take the iPhone user’s “access token.” These tokens are digital keys which grant them full control of the user’s Facebook account as well as because of Single Sign-On, any other websites the person connects to using their Facebook credentials.
Hackers can also gain access to accounts by using brute-force attacks. This method involves figuring out a password, typically the most commonly used ones, such as 123456789 and 1234567890. Also, hackers may gain access to accounts by sifting through compromised credentials. There are a variety of free tools that can be used to search for stolen information, including the popular website HaveIBeenPwned.