That's great! And it's not even an exceptional case. There are lots of tech-related companies with an explicit social and developing-world focus, including many in SF---such as our company, Angaza, which makes it possible for emerging-market consumers to get much more energy for much less money through decentralized solar

http://www.angazadesign.com/watch-video/ (obligatory: http://careers.stackoverflow.com/company/angaza/)

and many, many others, e.g.

https://welldone.org/ http://saner.gy/ http://wecyclers.com/ http://www.allpowerlabs.com/ ...

not to mention areas of "SF tech proper" with a direct positive impact, such as medtech or cleantech.