I think I played and quit Foursquare 4 times by 2010. It’s been a long time since I used it, but it’s still there… and the fan base seems loyal to publicly opt-in to their locations being known, and
The Evolving Check-In
Where people are isn’t as important as why they are there. The next stage is communing around the places, and understanding that the individual person is simply a node in a much vaster network.