Beyond the fact that this is an amazing invasion of privacy for many people, the program has a number of flaws. First off you have to have an acceptable phone to even have Loopt. This means that ninety percent, or more, of your contacts will not even have access to this application and therefore will not be able to be one of your friends. From this population they then must download the application and also add you as a friend, lowering the possible number even further. It is true that you can add people that are not already in your phonebook, but the chances that someone would want you as their Loopt friend but do not know you well enough to call is slim. This fact aside, the map that is used to actually show the location of people is slow to load at best. Often times it fails to load up period, rendering the program completely useless.