Twitter is all about false narcissism and acceptance, together in one package. The shallowness that comes with tweeting will be the reason it will be just a fad. As for its real communication value, that will simply be pushed aside by the next decent technological communication a short time a dozen these days. I give it two years' max (possibly end of 2010 even) before it becomes thought of on the same term as land lines — still useful to many, but just only when the newer alternatives are inaccessible. Quantitatively, that's a traffic ranking worse than 1,000 where a good online newspaper sits these days.
