for possible lone wolves to communicate with actual groups. offer themselves as potential terrorists. >> reporter: need proof? prosecutors say the men accused of the boston bombings used jihadi websites for inspiration and bomb building advice. security analysts say anwar al alawki exchanged e-mails with nadal hasan. and khalid shaikh mohammed 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