"The wave of online businesses with a social mission is coming quickly," according to this article on openforum.com.
The first company that comes to mind is Toms shoes - they're a ubiquitous example of a company with a social mission. More are coming, and I think that's a good thing. People often feel helpless to make real change in the world, but even a college student on a ramen-noodle budget can choose to do business with companies who are working to make the world a better place, not just enrich their CEOs and stockholders.
And, maybe even more importantly, a company with a social mission can advertise that fact - and then their competition starts to look like the wrong choice. Business as usual suddenly doesn't work so well... and to be honest, I think that's a good thing.