<p>The "War on Terror" may be raging, but one facet of terrorism is thriving -- and even expanding -- in the United States: the Web site.</p>
<p>Web servers owned by American companies host the sites of numerous terrorist organizations. For the most part, these companies are unwitting in their complicity. But terrorist groups continually exploit these servers to spread propaganda and plan attacks, either on message boards or through steganography, the process of embedding hidden objects in seemingly benign media files.</p>