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PledgeBank is a site to help people get things done, especially things that require several people. We think that the world needs such a service: lots of good things don't happen because there aren't enough organised people to do them.

PledgeBank allows users to set up pledges and then encourages other people to sign up to them. A pledge is a statement of the form 'I will do something, if a certain number of people will help me do it'. The creator of the pledge then publicises their pledge and encourages people to sign up. Two outcomes are possible – either the pledge fails to get enough subscribers before it expires (in which case, we contact everyone and tell them 'better luck next time'), or, the better possibility, the pledge attracts enough people that they are all sent a message saying 'Well done—now get going!'