Zillow (NASDAQ:_Z) is an online real estate database that was founded in 2005 by Rich Barton and Lloyd Frink, former Microsoft executives and founders of Microsoft spin-off Expedia. Zillow has stated that it is a media company that generates revenue by selling advertising on the Web site. In April 2009, Zillow announced a partnership to lend its real estate search engine to the Web sites of more than 180 United States newspapers as a part of the Zillow Newspaper Consortium. Zillow shares advertising revenue from the co-branded sites with the newspapers and extends its reach into local markets. In February 2011, Zillow and Yahoo! Real Estate launched an exclusive partnership creating the largest real-estate advertising network on the web, according to comScore Media Metrix. In April 2011 Zillow acquired Postlets, an online real estate listing creation and distribution platform. Terms of the deal were not disclosed. Zillow has data on 100 million homes across the United States, not just those homes currently for sale. In addition to giving value estimates of homes, it offers several features including value changes of each home in a given time frame (such as one, five, or 10 years),
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