I found the About page very useful for understanding the use case. I recommend putting the search feature that's on the About page on your home page as well.

Also, why is the ability to Add a role on the home page in the list of example roles? Perhaps if it was called Request it would make more sense.

The Browse section is for individual skills versus roles. It seems that having it centered on Roles makes more sense. At least have the option to browse Roles without following them.

Finally, I found a link to Vimeo for Product Launch Promotion wherein the Learning Jar panel initially appears but then disappears: "How to Earn Customers Without P..." http://vimeo.com/39473593