A Facebook reverse image search is the perfect way to find a friend's profile, copyright infringers, and more. Here's how to do it!

How to Find a Facebook Photo ID. When you upload photos to a Facebook album, each picture is assigned a unique identification number. This photo ID helps you single out an individual picture when ...

If you find a Facebook image through an image search such as Google Images, using this unique number in the image URL can help you find the profile associated with the image.