They are making money but probably not much. David once said they would probably make millions if they put a single AdSense banner in the Dashboard, but they re

They are making money but probably not much. David once said they would probably make millions if they put a single AdSense banner in the Dashboard, but they refuse to use regular advertising and want to make a more creative way of making money. (Source: http://techcrunch.com/2011/02/22/founder-stories-karp-tumblr-making-money/ http://techcrunch.com/2011/02/22/founder-stories-karp-tumblr...)