Poor app design
I love the concept, and the app version is essential for people who have a job when the voting boost only works for a few hours. However, the app has a lot of bugs. Joining a challenge is a challenge in itself if you want to choose the pictures you want to use yourself. And clicking “join” sometimes just takes you back to the front page. Once upon a time the app was great, but now it has a poor overview of the challenges you are participating in and the upcoming ones. I hope they will fix it soon.