[slucaskim]

The daily check ins require a photo upload. Of course people can cheat by uploading non-legitimate photos, or just lie, but for now we are maintaining the honor-system approach. We think this will work (and its working in the challenges we're currently running with people we don't know!) because the challenges are with small groups of people. If the groups were huge then it'd be way easier to blend in and cheat, but with smaller groups where you're building the connections, we hope that people find it less motivating to cheat.

Also, if we keep getting users, we will definitely keep improving the cheating detection mechanisms (using AI and other logic), and also adding features like reporting users, reputation scores, etc.!