Disclaimer: This is NOT an official Facebook app.
PictureMate is a single button on Chrome for you to find publicly tagged photos of anyone on Facebook without requiring to be friends with them.
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.