Maybe you were there when Neda died.

If you were, you saw a tragedy, of course, a 26-year-old Iranian protester gunned down in the streets. But I am convinced you also saw the future -- a profound change in the way you and I will henceforth comprehend the world.

Many of us -- your humble correspondent prominent among them -- have been less than impressed with the ubiquity of social-networking Web sites. Spurred by reports of congresspersons who tweet banalities during a presidential speech, of cyber-bullying and flash mobs, we have regarded them as an engine of vanity a...

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