The soccer world, with such global participation and such socioeconomic differences in its people, is the perfect place to make a serious social impact. Two existing organizations are favorites of ours in terms of their mission and reach.
The first is Passback. This long-established joint effort between US Soccer, MLS and Eurosport has a simple and admirable goal: collect used (but still usable) soccer gear and redistribute it to kids who need it- be they in NYC or Zimbabwe, according to the site. If you're an American soccer person you may have a duffle bag full of old gear...Give!
Right To Play is a Toronto-based organization that uses Playing Soccer to teach children on basic yet critical issues - from educational development to hygiene and health to community building. It capitalizes on the unifying power of the sport and a simple idea: bring kids together with soccer, and take advantage of that time together to make them informed advocates on these issues.
adidas recently jumped into the fray with a "Buy the Ball, Join the Movement" promotion. Their participation is very similar to the first movement that we are planning here at FCEarth, but that's okay- there's plenty of need, and plenty of room to harvest the social power of the sport.
And Soccer Without Borders is a San Francisco-based non-profit founded by former Lehigh University player Ben Gucciardi that works with community organizations to create soccer, arts and life skills programs for kids.
Incredibly important work going on, all over, all with soccer as a vehicle for change.