Staying connected with Dodgeball

Whether followers of Jesus go to a worship service or not (see sunday's post), they do tend to stay connected. Many of them turn up yearly at large festivals to "check in" to the wider family, and during the week they are in and out of each others houses.
I was wondering if anyone in USA was using Dodgeball social software to stay connected - it lets you know when you are within 10 blocks of any of your friends-of-friends. Not available here in London yet.