It's simple, you can upload a picture and people vote on which one they like better OR you can just vote on other people's pictures. This can help you with those tough decisions for which picture is better before you make your dating profile picture, post on Instagram, etc.You can see how other people voted on each picture after voting - so it's pretty fun to vote, give it a shot!
https://itunes.apple.com/us/app/picone/id1343700982?mt=8