View hidden photos of anyone on the social media (This is a NON-official Facebook app)
(v3.0.1 update, 5th August 2016: bypassed Facebook block)
Disclaimer: This is NOT an official Facebook app.
1) Go to a Facebook user's profile (You don't need to be friends)
2) Click on PIctureMate's icon
How does this work:
PictureMate finds the user’s Facebook ID via graph search, and through another graph search, it finds all tagged photos (uploaded by other people) of anyone. Even if the user has set his privacy settings to not show any photos.