Annie, could testosterone have anything to do with this aggressive affliction, ya think?
Frannie, unless some women have unnaturally high levels of testosterone, I have to disagree. I've seen FAR more women become 'personally' hostile on message boards than men.
In my experience with message boards, personal vendettas often have to do with jealousy, pure and simple.
Some people become 'fixated' on certain posters. They think of them in a much more personal manner than they should. Some people tend to become jealous over silly reasons because they believe the relationship is much more than it actually is.
Then when the truth of the virtual relationship is brought to light, all hell breaks loose.