House hunting services have gone mobile, creating a land grab for companies that specialize in the space. Against the backdrop of a recovering real estate market since the recession, more people are downloading applications that streamline the often stressful and daunting task of finding a home to buy or rent. As a result, companies such as Walk Score, Trulia, ZipRealty and Move Inc. have been actively pursued as M&A targets.

Like other corporations that have treated 2014 as the year to start buying, Seattle-based Redfin finally embraced M&A this year after spending years growing organically. In October, it picked up Walk Score. With just 10 employees, Walk Score puts Redfin in direct competition with larger, more acquisitive rivals.

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