Facebook is improving "photos" exprience on its site with focus on "uploading, browsing and tagging".
"For tagging, we began testing a faster and easier way for you to tag your own photos. You now can add tags with just a couple of clicks directly from your home page and other sections of site, using same face detection technology that cameras have used for years. If you do, you'll see following box while browsing Facebook:
With this, tagging is faster since face is already selected for you, just like those rectangles you see around faces when you take a photo with digital camera. With that all that's left for you, is type a name and hit enter," explains Facebook.