…but it's not just the feminist bloggers and tweeters who are withdrawing.  I know of male philosophers who have withdrawn for a similar reason–the main difference, of course, is that threats of sexualized violence are rarely directed at men in cyberspace.  But round-the-clock abuse, and threats of non-sexual violence, are a constant for anyone who takes positions that are at all controversial or non-mainstream.  The pathology of cyberspace and the ugly behavior it elicits warrants more attention from the law than it has yet received.