The hacker group that exposed a file containing about 450,000 Yahoo user names and passwords this week says the move was intended “as a wake-up call and not as a threat,” reports The Wall Street Journal. Yahoo says it is investigating the breach and that the compromised information belongs to Yahoo Voices, a self-publishing service. Less than five percent of the affected accounts had still-active passwords, Yahoo said, adding that it is changing affected users’ passwords. The breach also affected Gmail, AOL, Hotmail, Comcast, MSN and Verizon accounts, among others. CNET News reports on the most commonly used passwords exposed in the breach. (Registration may be required to access this story.)
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