DP Review: Cinnac is a Tinder-style photo rating app that helps you discover your best photos.

Looks really interesting, at first blush. Certainly rating systems on 500px, Flickr and others are broken; other than "Editor's Choices", you would be poorly served to copy the most rated examples on any of those services. There are some folks who shoot the same photo over and over and over and never grow as photographers. Maybe Cinnac will break the cycle.