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In a sign that many people now consider the service indispensable in any major event, New York's fire department decides it has to remind people with Sandy emergencies to stick to 911.
The Boston Police Department uses its official Twitter feed to disseminate information and gather potential evidence.
A professor of art and animation posts a picture of his young daughter doing yoga in a T-shirt that reads: "I will take what is mine with fire and blood." This is taken as a security threat.
Gawker and Gizmodo continue having difficulties, while others like Huffington Post, are back online.
Twitter got bigger than ever, and is now essential in daily life. When the pope tweeted, it capped a 2012 full of controversy, business battles, and helping spread crucial information.
IBM is laying out a vision in which managers and executives rely on hard, cold facts to make decisions, nudging out gut instinct.