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StickK lets you set a goal, notify a support group, and have an outsider weigh in and judge your progress, but the real motivation has to do with money. Here's how it works: you commit a certain amount to a goal; if you achieve it, you get the money back. If not, it goes to a third party, which can include someone, a charity you love, or, to up the ante, someone you don't like or a cause you don't support.

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