In the seven years since its founding, Twitter has become a go-to place for news updates, witty one-liners, political one-upmanship and even absurdist storytelling.
It's also become a go-to place for intolerant bile.
On Sunday night, Nina Davuluri, an American of Indian ancestry, was named Miss America. Immediately, the Twitterverse started spewing.
"This is Miss America... not Miss Foreign Country," said @MeredithRoanell.
"Congratulations Al-Qaeda. Our Miss America is one of you," posted @Blayne_MkItRain.
What is it about Twitter? Whether the events are earthshaking or trivial, the site of more than a half-billion accounts has something to say -- and often, it's upset.
Ben Affleck is named the new Batman; the anger flows. George Zimmerman is acquitted; people fly off the handle. Comments on sports, TV shows, politics, news media -- when there's something negative to be said, it will be said (occasionally with poor spelling and IN ALL CAPS) on Twitter.
As Stephen Colbert summarized the Miss America outcry on "The Colbert Report," "And Twitter, as usual, could not be happy."
David Reiss, a San Diego-based psychiatrist who specializes in personality dynamics, observes that Twitter's impulsiveness can get the best of people.
"It's very easy to jot something off and hit send, and you can impulsively say something without thinking it through," he says, noting that it's the reverse of the classic angry letter you write and then put in a drawer until you cool off. "With Twitter, you don't need to (do that). And if there is feedback or push back, you don't necessarily even see it."

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