Word: facebook
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Dates: during 2010-2019
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Telling your friends about your goal and staking some money on your success is a powerful combination. Says Karlan: "It increases the price of vice and lowers the price of virtue. We think of it as Facebook with a purpose...
...This is one of the coolest tools I've seen for booking travel and sharing trip information with friends. The site's completely integrated with Facebook, so you never have to create an account and it automatically finds your friends," wrote one account-holder...