Blair added that radicalization and recruitment foments suicide bombers. "Al Qaeda's radical ideology seems to appeal strongly to a group of disaffected young Muslims, and this is a pool of potential suicide bombers and this pool unfortunately includes Americans," Blair said.
The DNI said that Internet and social media sites have become critical to terrorism recruitment efforts. Speaking about the Hasan case and his alleged Internet communications with al Awlaki, Blair said, "The homegrown radicalization of people in the United States…is a relatively new thing."
Blair said U.S. intelligence was rapidly working to counter the emerging problem. "There are some technical things, which are making it more difficult, with the use of social networking as opposed to simply looking at a Web site and responding by e-mail."
Blair said this is "a threat, which may be increasing. We're taking it more and more seriously and this is a -- this is something that is very -- is potentially very dangerous to us because of all of the -- for all of the reasons of the rights that American citizens have.
"We may be shooting behind the rabbit here and it's moving faster than we thought and we're spending a lot of additional effort on that, to try and understand it." Blair said.