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Usability is a big factor. One thing that makes Swappa a lot easier to use, compared to eBay for instance, is you start out by choosing the device to buy and sell. It makes it real easy to see all the listings together and compare apples to apples. If you search eBay for ‘Motorola Droid’ you get listings for a half dozen different types of devices and their accessories, all in the same list. It’s a pain, and it’s ugly. Swappa is simple.If you haven't already, check out The Startup Foundry, Powered by blood, sweat, and tears of entrepreneurs. Thanks to Robbie and Paul for including Swappa.