Sony shares dropped 4.5 percent in Tokyo, to end the holiday-shortened week at 2,260 yen.

George Hotz, the hacker who received widespread grassroots support after being sued by Sony for posting code that can jailbreak Sony PlayStation consoles, blamed the company's recent data breach on executive-level arrogance. "The fault lies with the executives who declared a war on hackers, laughed at the idea of people penetrating the fortress that once was Sony, whined incessantly about piracy, and kept hiring more lawyers when they really needed to hire good security experts," said Hotz on his blog. "Alienating the hacker community is not a good idea."

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Sony hinted it is considering some form of compensation for users. , it wrote, "We are currently evaluating ways to show appreciation for your extraordinary patience as we work to get these services back online."