I tested the app and found it awesome that it doesn't require account creation! You just get a private link, share it with the group, and when they open the link, it asks who they are to 'log in' as themselves. Of course, users could game the system by logging in as other members, but I think it's a compromise the developer made, knowing the user base and how frictionless it makes the user experience. Neat.
replies(2):