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A hacker attack Thursday shut down the fast-growing messaging service Twitter for hours, while Facebook experienced intermittent access problems. Twitter said in its status blog Thursday morning it was "defending against a denial-of-service attack," in which hackers command scores of computers to a single site at the same time, preventing legitimate traffic from getting through.
"I had to Google search Twitter to find out what was going on, when normally my Twitter feed gives me all the breaking news I need," said Alison Koski, a New York public-relations manager. She added she felt "completely lost" without Twitter.