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Google is an American multinational technology company specializing in Internet-related services and products. These include online advertising technologies, search, cloud computing, and software. Most of its profits are derived from AdWords,an online advertising service that places advertising near the list of search results.http://en.wikipedia.org/wiki/Google
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facebook is a social media site made by Mark Zuckerberg while he was in his univercity bedroom. He initially limited the website's membership to Harvard students, but later expanded it to colleges in the Boston area, the Ivy League, and Stanford University. http://en.wikipedia.org/wiki/Facebook
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Twitter is an online social networking service that enables users to send and read short 140-character messages called "tweets".
Registered users can read and post tweets, but unregistered users can only read them. Users access Twitter through the website interface, SMS, or mobile device app Twitter Inc. is based in San Francisco and has more than 25 offices around the world.http://en.wikipedia.org/wiki/Twitter -
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Facebook 'likes' system for company pages make it possoble for producers to connect directly with consumers