What the internet knows about you.
Shocked? I was, even though I already knew it was possible and fairly easy to trace someone's browsing behaviour if you really wanted to bother, this is the first time I read that it's possible for any site to check what your browsing history is. I now set my firefox to delete browsing history every time I close the program. I also disabled the 'visited links' option, and just for the occasional emergency I installed videlia's TOR & Torbutton (though I'll keep it disabled most of the time).