See the full case study here: http://www.microsoft.com/casestudies/Case_Study_Detail.aspx?CaseStudyID=4000007618  

Founded in 2006, FreedomSpeaks is one of the first political social networks in the United States. The organization advocates open communication and transparency between elected officials and their constituents, and uses technology to support this endeavor. In addition to its political activism website, the company acquired a mobile product called CitySourced that allows citizens to send comments and concerns directly to local governmental agencies via smartphone devices. To support this offering, FreedomSpeaks needed to migrate its existing infrastructure to an on-demand, internet-based—or cloud-computing—technology platform. After evaluating competing cloud-based offerings from Amazon and Rackspace, FreedomSpeaks selected the Windows Azure technology platform for its cost-effectiveness, easy integration with the company’s existing infrastructure, and scalability.