"I think that the Internet was correctly seen by al-Qaida and its fellow jihadis as a vacuum they could fill and they have filled it very well," Hoffman says. "And we are just now, unfortunately, paying increased attention to this particular new threat."President Obama, in Oslo to accept the Nobel Peace Prize, declined to talk specifically about this latest case. He did say "we have to constantly be mindful that some of these twisted ideologies are available over the Internet."