If you suspect that your Facebook account has been compromised, you must change your password immediately. If you use Facebook as a login for apps like Spotify or Instagram then change the logins. This will prevent the hacker from accessing these services via your hacked Facebook account.
A compromised Facebook account can provide hackers with an unending supply of personal information. Hackers can make use of this information for nefarious purposes, such as getting credit card numbers, and sending out fake credit card offers or scams using phishing. They could also use the hacked account to send threatening messages to friends, or share a status update on your timeline that includes your name (as as if you had done it yourself).
Hackers are more likely to gain access to accounts through exploiting a flaw in the Facebook application code. A flaw in the iOS Facebook app allows hackers to take over cookies, and steal the “access token” of an iPhone user. These tokens are digital keys, grant the hackers full control over the user’s Facebook Account, and any other website they visit with their Facebook credentials.
Hackers also have the ability to gain access to accounts through brute-force attacks. This technique involves guessing passwords, typically the most commonly used ones like 123456789 and 1234567890. Also, hackers may gain access app-ink.net/transitioning-from-the-drm-to-the-vdr to accounts by sifting through compromised credentials. There are a variety of free tools that can be used to search for stolen information, including a popular site called HaveIBeenPwned.