and bomb building advice. security analysts say anwar al alawki. and ka limb sheikh mohamed is believed to have used a hotmail account. >> al qaeda started with one a decade ago. we have at least a dozen al qaeda web forums that host thousands of individuals. >> reporter: a few years back when the hunt for osama bin laden was still raging, some intelligence forces believed al qaeda was even developing its own intranet that was electronically hidden behind jihadi websites and accessible to only a few people. whether they succeeded or such a system still exists like much of the communication structure remains shrouded in mystery. tom foreman, washington. >> of course the great irony using so much american innovation to try to destroy