Comment by harimau777

I think that a reasonable argument that tracking someone's movements can give significant insight into private communication. If you know who someone is talking to, when, where, and how often, then you can deduce a lot of what they are communicating.

I'm not sure about your argument about giving up freedom for security. One of the quotes that has become embedded in American social consciousness is Ben Franklin's "Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety".