The only verified methods to see restricted content on Facebook involve authorized access: Friend Request

Facebook invests millions of dollars in security and infrastructure. The privacy settings that restrict who can see a profile or specific photos are enforced on the server side. This means the data is never sent to your browser unless you have the correct permissions.

Users are often trapped in surveys that never deliver the promised result, generating revenue for scammers while collecting your phone number or email.

What these sites actually do is much more sinister than just failing to show you a photo: Phishing Traps: