Foursquare is being feted as the Twitter of 2010.

The tie in between location, service and social networking are likely to have consequences for event planners in the future - in many ways the game parts of Foursquare mimmic the type of interactive team builds we have been running for some time.

For an insight into Foursquare and how it's working now...http://mashable.com/2010/01/16/foursquare-world/