Dennis Crowley Quotes
Between the three, Facebook is literally everyone I've ever shaken hands with at a conference or kissed on the cheek at Easter. Twitter seems to be everyone I am entertained by or I wish to meet some day. Foursquare seems to be everyone I run into on a regular basis. All three of those social graphs are powerful in their own.
Citations
Crowley, Dennis. "Comparing Facebook, Twitter, and Foursquare." TechCrunch, Yahoo, 2010.
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Dennis Crowley is an American Internet entrepreneur who co-founded the social networking sites Dodgeball and Foursquare.