New York Magazine proclaims, "Twitter is the hot web company right now...the Next Big Thing;" the New York Times calls it "one of the fastest-growing phenomena on the Internet;" Time magazine claims "Twitter is on its way to becoming the next killer app;" and Newsweek notes that "Suddenly, it seems as though all the world′s a-twitter."

Since its creation in March 2006, Twitter has unleashed a torrent of self-expression from its six million members around the world, who send and read each others′ "tweets," messages up to 140 characters in length. Friends use the site to...