If you suspect that your Facebook account has been compromised, you should change your password immediately. If you use Facebook as a login to applications such as Spotify or Instagram then change the logins. This will stop the hacker from gaining access to these services via your compromised Facebook account.
Hackers can discover an abundance of personal information in hacked Facebook accounts. Hackers could make use of this information for nefarious purposes such as spamming https://www.app-ink.net/guardian-property-management-trustworthy-service-from-reliable-company people or sending fake credit card offers. They could also use the hacked account to send spam messages to family members, or put up a post on your Facebook timeline with your name (as as if you had done it yourself).
Hackers are more likely to gain access to an account by exploiting a flaw within the Facebook application’s code. For example, a bug in the iOS Facebook application let hackers hijack cookies and take the iPhone user’s so-called “access token.” These tokens are digital keys that give them complete control over the user’s Facebook account — and because of Single Sign-On, any other websites the person logs into with 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 an account by scanning for compromised credentials. There are several tools for free that can be used to scan for stolen information, such as the popular website called HaveIBeenPwned.