Charity Hack 2010 entryWe Give —
In Web2.0-speak it's mix of Lanyrd and Groupon.
Allows people to set up challenge for their friends: I donated X, and if my friends donate XX, then I'll donate X more.
For the challenger this gives good excuse to tell all their friends which causes he/she supports.
Friends can do something together towards a charitable goal. We're showing who's donated already, so there's peer pressure to join in.
We're pulling friends from Twitter, so users can browse their social graph and see what their friends support, discover new charities supported by their friends.
Company twist: companies can set up challenges as well. You can get your friends together to reach a set goal and make the company double what you've raised.
Code is pretty clean for something that was built literally overnight! Of course there are big unfinished gaps.
It uses PayPal AdaptivePayments API to pre-approve all payments upfront. MissionFish for discovery of charities and distribution of donations. Twitter OAuth for login and friends.