"They're proving that 140 characters can build an instant mass market, " he says.

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Instant messaging, texting, and 140-characters tweets all place a premium on space.

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And unlike at the park, where character greetings seem hidden, sporadic, and have incredibly long lines, on the Dream, kids have almost instant access to any number of their favourite characters who stroll the ship as though they are on vacation too.

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Twitter, a social-networking blog site, allows users to send status updates, or "tweets, " from cell phones, instant messaging services and Facebook in less than 140 characters.

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