Loopt and Buddy Beacon: Tracking people

Loopt and Buddy Beacon are two mobile services that allow you to locate your friends and family and allow them to locate you. This can be a really good thing for many people, especially young adults. At football games or concert events, it would be really nice to be able to find your friends if you get separated; however, these services could also cause problems with friends or family, specifically parents or significant others becoming too invasive. You can block people with these programs, but that in itself is what would cause the problems. I think it is more helpful than harmful though. Maybe it is something that should only be used when necessary in a crowded or unfamiliar place and not on a daily basis.