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Facebook, one of the most popular social networks in the world, has more than 400 million registered people on its Web site. Half of these users log in to the service every day, the company says, and users spend 500 billion minutes on the site each month.
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The one thing she doesn’t use her cellphone for? Making calls.
“I probably only talk to someone verbally on it once a week,” said Mrs. Colburn, a 40-year-old marketing consultant in Canton, Mass., who has an iPhone.