Folks are talking about folks who out anonymous bloggers.
I have some experience with being outted. I’ve been outted against my will a few years ago, when someone figured out who I was and posted my name and address and work information in the comments here and all over the place. I outted myself in a news story that appeared on the front page of The Tennessean, which I thought was going to be pretty definative, but then a couple of months after that, someone got mad at me and made noises like wouldn’t it be uncomfortable for me if folks knew who I really was, and I emailed them back and pointed out the article and that was the end of that.
Still, it’s a weird phenomenon, both to find yourself going in and out of anonymity and to find that people get so riled up about what goes on here on the internet that they’d try to threaten exposing you over it.