[citation][nom]soundefx[/nom]Wouldn't it be easier to get a person's name and have the cell phone company track you?So what if you know my name and relationship status?[/citation]
They are already doing that.
And, if they know all your friends, they know you got no where to hide if you run. Even if you purposely don't keep contacts with your escape point, somebody else might have, friend of friend, and hop, they got you. That is assuming you do something wrong. If you don't, they don't care.
It is not a means to get the high profile 007s. It is a means to get normal criminals, or those that go and update their facebook status after escaping from prison or check facebook while robbing a house.