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"Microblogging giant Twitter isn't just responsible for pioneering social media and Internet communication, the company is helping put San Francisco on the map as a business hotspot, ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/twitter/2012/05/11/twitters-san-francisco-office-relocation-drives-local-rent-prices-up-60/>