#6. Fact 6:

Advertising is one of the biggest drivers of the search giant’s revenue gains. In 2013, about 91% of Google's $55.5 billion revenue was derived from its advertising programs. Google's AdWords allows advertisers to display their advertisements in the Google content network, through either a cost-per-click or cost-per-view scheme. The sister service, Google AdSense, allows website owners to display advertisements on their website and earn money every time the ads are clicked.

#7. Fact 7:

Google's search index is more than 100 million gigabytes in size. It would take 100,000 one-terabyte personal drive to contain the same amount of data.

#8. Fact 8:

Google might be the only company with a clear goal to reduce the amount of time people spend on its site. The company uses a policy often called Innovation Time Off, where Google engineers are encouraged to spend 20 percent of their work time on projects that interest them.

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