Dennis Crowley Facebook Quotations

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.

Facebook is about sharing experiences that you've had. Foursquare is more about the present tense and the future tense.