I've seen so many models of retail websites, storage clouds or even writing the app. But I can't find something that fits me or makes me even discover the option of implementing it.
As for example, a retail website offers credit for shopping, even Airbnb offers $25. For every friend invited on Dropbox you get space. On Evernote you get points.
We thought about points version, but it creates a full marketplace you have to build and test. Thus, we don't have time for that.
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