If you study jihadis on the Internet for any length of time, you come to realize that there are many more people who self-identify with the global jihad than there are people participating in terrorist activity. In other words, if the jihadi web - the system of interlinked static sites, libraries of documents, forums, blogs, YouTube sites, virtual worlds, etc. - are a sort of factory, into one of which march aspiring terrorists, and out the other end come dead bodies, then clearly the production process is a highly inefficient one, at least outside of conflict zones such as Afghanistan...