Facebook has the largest population on the world wide web and it has a viral effect on distributing data. They have a lot of ways to pass data from one user to the other and one is by tagging pictures. When facebook started this feature it was so hard to tag friends because you need to tag them one by one and its a time consuming way of letting your friends know that they exist in a picture and now they have this face recognition feature that automatically detects a face when you upload an image. Though its not that accurate but it helps. Another way of doing this is by using an application that face.com developed. The application is called PhotoTagger, the application collects photos from an album and automatically detects faces and you can automatically tag all faces based on what their application has detected. It’s an amazing tool which I find it useful especially when you are trying to tag your friends on a large pile of photos. A screenshot of the application is found below and you can find the application by going to www.face.com and hit BIG go button and give it permission to start tagging your friends on an album.