Ignore the Twittersphere? Major brands learn that they had better respond -- and quick

Amazon.com Inc. shut like a book.

Domino's Pizza Inc. was late but eventually delivered.

And CNN focused on the good news.

When the three major brands engaged with their Web-savvy fans and critics in separate incidents last week, their responses demonstrated how corporations are still learning how to control their messages -- and reputations -- in a fast-twitch online world.

The mixed track record so far shows that fluency in the evolving language of digital public relations comes easier to some companies than others.

First, CNN: As Ashton Kutcher edged out the cable TV network last week to become the first to attract 1 million followers to his Twitter account, an odd quirk of the much-hyped race was overshadowed: CNN hadn't actually owned its account until a few days earlier.

For more than two years, the CNNBrk account (for breaking news) had been created, maintained and run by a 25-year-old British Web developer who just wanted a way to beam short news alerts to his cellphone.

But when CNN found out that James Cox had appropriated its name and content, it took a direction that might seem a bit surprising for a major media company. Instead of suing Cox or trying to shut down the account, CNN quietly hired him to run it -- and then acquired it last week when Cox was visiting the company's Atlanta headquarters.

"We've been managing the feed through him," said KC Estenson, the head of CNN's online operation, noting the huge increase in the number of Twitter followers since the November election. "As Twitter took off and became more prominent, we decided it was time to take our engagement and make it a marriage."

Other companies may find that unexpected uses of their brand have a less than fairy-tale quality.

Last week, Domino's was handed a PR nightmare when a video showed up online showing two employees laughing as they prepared food in a deliberately unsanitary way.

The video quickly garnered hundreds of thousands of views.

Domino's initial instinct was to try to dispose of the situation quietly by responding only to concerned consumers who had already seen the video, rather than risk broadening its exposure by making a public statement.

But chatter about the problem spilled over into Twitter, whose expansive micro-messaging network is becoming an online circulatory system for news, pumping information between media organs, consumers and businesses themselves.