Cyberspace was once a place inhabited largely by government agencies and academics linked together through a decentralized collection of computer networks that came to be known as the "Internet." The late 1980s and early 1990s gave birth to a torrent of commercial entrants into cyberspace, with the way led by Compuserve and then Prodigy and America Online. By the end of this year, an estimated four million American households will be online with these commercial services, which are the three largest such enterprises in the U.S. Additionally ....