ChallengePost is a marketplace for challenges. It enables participant challengers to post challenges to solvers. Like create a new iPhone app that does something special, a cheap, small solar-powered generator, or a better way to teach kids math. ChallengePost allows individuals and organizations to create challenges to competitively solve their challenges.
United States of America
ChallengePost is a privately funded start-up based in New York City. Individuals, Corporations, Foundations, or Government Agencies post a challenge. If it's an Open Challenge, other users may join a challenge and pledge to contribute money or simply declarations of why it is meaningful to them. The pledges are only payable if a challenge is solved and act as the incentive for others to solve the challenge and earn money, status, and recognition. Solvers receive public thank you notes that appear on their profile pages, along with the names of those whom they've helped and why their contribution was valuable.