Many "leaked" lists are actually bait. Malicious actors create fake login pages to trick users into entering their own credentials, which are then added to a new list to be sold or shared.
When you see websites or forums advertising "free Facebook logins," you aren't looking at a legitimate service. These lists are almost always the result of or credential stuffing . list of facebook account and passwords
Accessing someone else’s private account without permission is a federal crime in many jurisdictions (such as the CFAA in the U.S.). Even possessing stolen credentials can lead to legal trouble. Many "leaked" lists are actually bait
Hackers break into a third-party website (like a gaming forum or a smaller e-commerce site) and steal their user database. If those users used the same password for Facebook, their accounts become vulnerable. These lists are almost always the result of