This is a Google "dork" or advanced search operator. It tells the search engine to look for web servers with "directory listing" enabled—essentially showing a list of files on a server rather than a rendered webpage.
Hackers seek out verified Facebook accounts because they carry a "trust signal." These accounts are used to: index of passwordtxt facebook verified
Run fraudulent ad campaigns using the victim's attached credit card. Spread high-reach misinformation. This is a Google "dork" or advanced search operator
Go to your Facebook Security settings and "Log Out" of any devices or locations you don't recognize. The Bottom Line index of passwordtxt facebook verified