Check this out from Google Trends:
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Did Facebook hit an inflection point in early 2009? Google must have much better data sets, probably one reason Hal Varian left Berkeley for Google.
Explore the Facebook inflection point in early 2009 and discover insights from Google Trends data that unveil this shift.
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Check this out from Google Trends:

Did Facebook hit an inflection point in early 2009? Google must have much better data sets, probably one reason Hal Varian left Berkeley for Google.
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