Everyone's favorite online Photo management tool, Google Photos, is pretty popular. At the company's annual developer conference, I/O, Google just announced that Photos has over 200 million monthly active users, with over 2 trillion labels automatically applied to a variety of different photos. CEO Sundar Pichai said a lot of these were labelling selfies, which is mind-boggling when you think just how many selfies must be taken every day.
These usage statistics are pretty cool, especially for a product which only launched at last year's I/O. I personally use Google Photos for all my photo management, and can attest to how well thought out I find the entire product. Download the app on the Play Store, or at APK Mirror if that's your thing.