The first thing you should do if you suspect that your Facebook account has been compromised is to change your password. If you use Facebook as a login for apps such as Spotify or Instagram make sure you change the logins. This will stop hackers from gaining access to these third-party apps through your compromised Facebook account.
Hackers can access a wealth of personal information in compromised Facebook accounts. Hackers could make use of the information for malicious reasons like contacting people or sending fake credit card offers. They can also use the compromised account to send spam messages to family members, or share a status update on your timeline that includes your name (as as if you did it yourself).
Hackers are her explanation most likely gain access to an account by exploiting a flaw within the Facebook application’s code. For example, a bug in iOS’s Facebook app allowed hackers to hijack cookies and get an iPhone user’s “access token.” These tokens are digital keys that allow them complete control over the user’s Facebook account as well as through Single Sign-On, any other websites the person uses their Facebook credentials.
A hacker can also gain access to a user’s account by using brute force attacks. This method involves figuring out passwords, mostly the most common ones like 1234567890 or 123456789. Hackers can also gain account access by scanning compromised credentials. There are a variety of free tools to check for stolen information, including the popular site HaveIBeenPwned.