People can be identified by way too many things - if you're Facebook and you buy all data available for sale and correlate and enrich it, then you're known fore

People can be identified by way too many things - if you're Facebook and you buy all data available for sale and correlate and enrich it, then you're known forever and every step you make is also recorded and analyzed. Worst of all, they are those idiots who take pictures all the time and you eventually end up in pictures from many angles (all timestamped and geolocated). Combined with "anonymized" data from, say, carriers, you're no secret to anyone. But the biggest problem is that even if Facebook doesn't trace you, the governments will, and they have a lot more sources. Privacy is extinct!