Kevin: Good piece looking at location and social networking. I've started using FourSquare recently, and as a Nokia smartphone owner, I suffer from lack of a native app. I know that I'm just starting to scratch the surface of it, but for me, FourSquare is too narrowly pitched. I find the game element artificial. FourSquare has a lot of mindshare at the moment, but for me Twitter has more utility. (Having said that I didn't quite see the utility of Twitter when I first started using it.) I do agree that the promoted tweets based on your location has great potential as a revenue stream for Twitter.
Kevin: Some fascinating statistics showing Twitter's international growth. Kit Eaton writes at FastCompany: "Specific events around the world sparked peaks in international growth, Sanford notes–with the February 2010 Chilean earthquake prompting a 1,200% spike in member sign-ups. A 300% spike was seen after Colombian politicians began to use the system, and speedier growth was seen in India after local politicos and Bollywood stars began to Tweet."
