The presence of terrorist speech on the Internet tests the limits of the First Amendment. Widely available cyber terrorist sermons, instructional videos, blogs, and interactive websites raise complex expressive concerns. On the one hand, statements that support nefarious and even violent movements are constitutionally protected against totalitarian-like repressions of civil liberties. The Supreme Court has erected a bulwark of associational and communicative protections to curtail government from stifling debate through overbroad regulations. On the other hand, the protection of free speech has never been an absolute bar against the regulation of low value expressions, such as calls to violence and destruction.
Terrorist advocacy on the Internet raises special problems because it contains elements of political declaration and self-expression, which are typically protected by the First Amendment. However, terrorist organizations couple these legitimate forms of communication with calls to violence, recruitment to training, and indoctrination to belligerence. Incitement readily available on social media is sometimes immediate or, more often, calibrated to influence and rationalize future dangerous behaviors. This is the first article to analyze all the Supreme Court free speech doctrines that are relevant to the enactment of a constitutionally justifiable anti-terrorism statute. Such a law must grant the federal government authority to restrict dangerous terrorist messages on the Internet, while preserving core First Amendment liberties. Legislators should develop policies and judges should formulate holdings on the bases of the imminent threat of harm, true threats, and material support doctrines. These three frameworks provide the government with the necessary constitutional latitude to prosecute dangerous terrorist speech that is disseminated over social media and, thereby, to secure public safety, without encroaching on speakers’ right to free expression.