This article does not offer substantiation in the form of statistics. Instead, it offers personal insight and specific references. I'm not a happier person for reading it.
Death Threats and Hate Crimes, Attacks On Women Bloggers Escalating
I was not sure what to make of that post, besides that I was unhappy with its content. Then I got a comment back, with this link, which is another side of the story. Naomi Dunford’s Death Threats and Hate Crimes