Designing for Social Interaction - Boxes and Arrows: The design behind the design
http://boxesandarrows.com/view/designing-for-social

Designing for Social Interaction Strong, Weak, and Temporary Ties By Paul Adams Senior User Experience Researcher at Google. I'm the research lead for sociability, and I work with teams building products and features for the social web. I've previously worked as a User Experience consultant at Flow (working with the BBC, The Guardian, Vodafone, London Underground, and others), and as an Industrial Designer at Dyson.

RT @timkastelle: Terrific post! Can't find who mentioned it first - Designing for Social Interaction http://bit.ly/axYN9P