Searching for lists of Facebook accounts and passwords online is a common behavior, but it is important to understand the reality behind these "leaks" and the risks involved. Most websites claiming to offer free logins are either scams, outdated databases, or traps designed to steal your own information. The Truth About Public Password Lists
Facebook employs automated systems to detect and block bulk login attempts. They also: list of facebook account and passwords top
Searching for or using "leaked" credential lists is highly risky for both the person searching and the owners of the accounts: Searching for lists of Facebook accounts and passwords