31. Facebook Camera
Considering Facebook is the largest image-sharing site on the Internet, it makes sense for the company to chisel off its most popular feature into a stand-alone app. The Camera app added much-needed features like the ability to share multiple images. Users can quickly do some light editing to photos and easily tag friends in photos by simply tapping their image. It's not revolutionary, but for those who post a ton of photos on Facebook, it's much needed.