WaterForward is a fun project they did for free in Inferno this year. The challenge was simple and you can make a charitable site grow virally
https://archive.charitywater.org/
By reaching about 5 million people (explosive viral growth in india randomly) Raising awareness of the water crisis and giving millions of people Donate and help solve the water crisis Transfer all proceeds to charity in a water crisis solution Share WaterForward users in a charity mailing list: Water that will continue to re-engage users.