Yeah, but how long ago was that? (And I'm not making a rebuttal... it's a real question.)
The fact that they are storing every data stream they can get their hands on is bad news. Google, for instance, is very good at parsing data. Google also saves your email and search history FOREVER. As they get better at parsing the data, they will be working backward. My gawd... who the fuck knows what I said on USENET in 1998? Google knows. Their buddies know.
Does anyone give a shit about me? Probably not. Are they building algorithms that assigns scores to people? Just like they do websites? I'm certain they are. And while they may not be very accurate, they'd rather wisk away innocent people than let people who dislike their political philosophy go free. They don't make laws like NDAA for no reason. They make them to use them.