Not mentioned in this article, but yesterday or the day before, the Islamic State (or someone pretending to be them) went on Twitter to solicit suggestions on how they should kill a Jordanian pilot they claim to have captured, complete with a hashtag and everything (in Arabic). Apparently they got several thousand retweets and suggestions.

This is running up against the limits of free speech and I'm wondering how long before firms like Twitter are held responsible for the degree to which they knowingly provide a platform to enemies of their domiciles.