Because it's a very short hop from what's described here to full-on tracking, and some marketing company knowing where you are, what you're doing and who you're

Because it's a very short hop from what's described here to full-on tracking, and some marketing company knowing where you are, what you're doing and who you're with at all times. It's a similar situation to Google's street view - sure, it's in theory in the public domain, but when you start aggregating this sort of thing and making it searchable, it's different.