Young Social Entrepreneurs

I'm really stuck on social entrepreneurship--from posting about social entrepreneurial courses and institutes at business schools, to the reading list I gave you last week, I'm realizing more and more that there is something really special and unique about the combination of business and social awareness.
This week, take a look at these young people who are changing their world with whatever resources they have available.
Another inspiring story: these women started an upscale club/boutique/craft shop after being inspired during a course in business school!
Providing a service to others based on skills you already have or a hobby you already love is simple and satisfying--how about a local meals-on-wheels or creating a healthful food cookbook if you love to be in the kitchen, starting or participating in a Big Brothers Big Sisters program or gathering the names of reputable babysitters and caregivers, if children are your passion?
What experience have you had participating in, or building, a program for the community?