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http://andrewchenblog.com/2008/12/29/freemium-business-model-case-study-adultfriendfinder-arpu-churn-and-conversion-rates/
An interesting case study with real numbers by Futuristic Play by wallenMar 1, 2009
though the site itself is not mainstream for most web entrepreneurs by wallenMar 1, 2009
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