I was thinking about this today as I went through my browsing history from half a year ago. I'm not too worried. If anyone had access to that data they still wouldn't know what I was up to, what adventures I had, or even anything significant about me as a person. Cross-referencing to any posts I had made wouldn't help much, especially as I'm a big troll and write whatever nonsense I want. Maybe they would know some of my preferences back then, but those have changed by now. I think the problem is a lot of people lead ritualized, static lives, carrying around the same identities and ego structures for years and years. Such people are easily predictable, and controllable.