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Growth
While the primary business interest is in the web content arena, Google has begun experimenting with other markets, such as radio and print publications. On 17 January 2006, Google announced the purchase of a radio advertising company "dMarc", which provides an automated system that allows companies to advertise on the radio.This will allow Google to combine two niche advertising media—the Internet and radio—with Google's ability to laser-focus on the tastes of consumers. Google has also begun an experiment in selling advertisements from its advertisers in offline newspapers and magazines, with select advertisements in the Chicago Sun-Times.They have been filling unsold space in the newspaper that would have normally been used for in-house advertisements.
Acquisitions
Since 2001, Google has acquired several companies, mainly focusing on small start-ups.
In 2004, Google acquired a company called Keyhole, Inc.,which developed a product called Earth Viewer, renamed in 2005 to Google Earth.
In February 2006, software company Adaptive Path sold Measure Map, a weblog statistics application, to Google. Registration to the service has since been temporarily disabled. The last update regarding the future of Measure Map was made on 6 April 2006 and outlined many of the known issues of the service.
In late 2006, Google bought the online video site YouTube for $1.65 billion in stock.Shortly after, on 31 October 2006, Google announced that it had also acquired JotSpot, a developer of wiki technology for collaborative Web sites.
On 13 April 2007, Google reached an agreement to acquire DoubleClick. Google agreed to buy the company for $3.1 billion.
On 2 July 2007, Google purchased GrandCentral. Google agreed to buy the company for $50 million.
On 9 July 2007, Google announced that it had signed a definitive agreement to acquire enterprise messaging security and compliance company Postini.
On August 5 2009, Google announced the purchase of video software maker On2 Technologies for $106.5 million - its first acquisition of a public company.
On 24 November 2009, Google announced the purchase of Teracent, a California based start up company, for an undisclosed price. This is another acquisition on Google's behalf in a series of advertising related purchases- AdMob, Double Click.
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(编辑：Sally)