Refer.ly, a Y Combinator-backed startup that makes it easy for people to earn affiliate revenue every time they recommend a product or book, is now allowing its users to donate their earnings to charity.

The company, which only just launched six weeks ago, is syncing up with about 100 charities or so including the March of Dimes and American Heart Association. All proceeds can go to a user’s charity of choice. Refer.ly takes no cut. The company also started a summer reading campaign on behalf of Room to Read, which builds libraries in the developing world. The company is donating $1 for every book purchased through Refer.ly this month.

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