Hackers attack Twitter, Facebook also slowed

Both social networking sites seem to be functioning at least intermittently

NEW YORK - 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.

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