There's a famous Norman Rockwell painting titled "Freedom of Speech," depicting an idealized American town meeting. The painting, part of a series illustrating F.D.R.'s "Four Freedoms," shows an ordinary citizen expressing an unpopular opinion.

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While greed may seem an obvious motive for crowds that stampede retailers in search of bargains at this time of year, experts say fear also plays a significant role.

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The concept of the "wisdom of crowds" is a fundamental building block of a lot of the Web 2.0 services that we see today. While not all of them are built on this core concept, major sites like Digg, Wikipedia, and Mahalo rely heavily on crowds being wise.

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I study languages -- Italian, French and German. And this summer -- now that it looks as though I won't be able to go home to China -- I'll take up Arabic. My goal is to master 10 languages, in addition to Chinese and English, by the time I'm 30.

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Cellphone videos that depict a teenage girl being stoned to death by a crowd surfaced online last week.

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The internet is many things; one it does really well is be an angry mob.

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