I love the emphasis on categories in Peakd and organizing stuff in various ways to make it user friendly. That is SO key to retention— being able to find stuff quickly and effectively.

I currently look to Facebook as a model of what a "user group" could do. Even better than that would be the ability to have tiers of membership or even some kind of paid membership (or access if you're holding a token, etc.) Subscribing to me means, I follow the posts and get them in my feed. Being a member means, I'm able to post in the group itself and show up on all subscriber feeds. That is how I would like to see it perform.

As for the dashboard, sorting is a great idea and in all different ways. I'm personally looking for communities with common interests, and then also ones with active users, and places I can post as well as curate.