Consequently, it does not apply to other forms of offensive speech, such as hate messages directed against racial, ethnic, or religious groups; recruitment for exploitative religious cults; or advice for terrorists, such as how to make bombs.
Such messages, are, obviously, morally repulsive, whether posted on the Internet or elsewhere. Equally obviously, they cannot be prohibited by the government under our constitutional system which guarantees freedom of speech. The best way to combat bad ideas is with better ideas.
Incidentally, it is arguable that pornography---some or all of it---is itself a form of hate speech against women. (See, e.g., Fedler 1995)
In fact, while Congress was considering the CDA, the Justice Department itself expressed to Congress its view that the CDA was not necessary because existing laws against obscenity and child pornography gave it ample weapons for prosection.
Nevertheless, the three-pronged test of obscenity defined in Miller v. California has made it very difficult to prosecute cases for obscenity, so that prosecutions are rare, and convictions are even rarer. (Schauer 1995)
The Thomases, operating a computer bulletin board in California, could have decided not to send materials to Tennessee, and so not be subject to Tennessee's more stringent standards. However, the decision not to send material to a certain geographic region, any more than to a certain age group, is typically not within the power of content providers on the World-Wide Web and most other Internet services, so it is doubtful whether this decision would apply to the Internet.
On the other hand, perhaps commercial pornographers on the Internet, using credit card verification and adult ID, would be able to limit their distribution geographically as well as by age.