Some shady forums sell access to a "database" of private profile pictures.
Facebook’s architecture ensures that if a user sets their profile picture or albums to "Only Friends," the data is simply not delivered to anyone who isn't on that list. No "viewer" website can bypass this without the user's password or an authorized session. The Danger of "Viewer" Websites facebook private profile picture viewer online
Q: Can I use a Facebook private profile picture viewer on my mobile device? A: It's not recommended to use a Facebook private profile picture viewer on your mobile device, as it may install malware or compromise your data. Some shady forums sell access to a "database"
These scam tools typically function in three ways to exploit the user: facebook private profile picture viewer online