Kevin: Om Malik has a very plausible explanation of Foursquare's business strategy. "Foursquare wants more folks to use its application-programming interface (API), and thus build an ecosystem around Foursquare’s data." The more people who build apps using its API, the faster it will grow and the easier it will be start monetising its business. "Foursquare (and others like it) can essentially bring a cost-per-action business model to the real world, perhaps either supplanting or complementing traditional forms of advertising." Very intriguing idea.

Kevin: Larry Magid has some good thoughts about how location sharing is going mainstream with the release of Facebook places. Key to this will be easy systems that users can use to protect their location from being used in ways that they don't want or don't intend. I think this is where Facebook might be in some difficulty because they have shifted how they use and expose personal data over time.

Kevin: Air New Zealand rewards 'mayors' on Foursquare with access to its airport loungs. This is a good way use location-based technology to reward loyalty.