Here is an example of how I can imagine this plugin being used: http://www.carthrottle.com/discuss/ I could definitely use this plugin if you could integrate a front-end user selectable sorting for latest, top, and trending.
I had this issue and figured out you have to Change the Profile Permalink Structure option to User ID or full name or Display name instead of username. Unfortunately Userpro is setup to assign the user’s email from facebook as their username when they register with facebook.