Yahoo Inc. on December 14 announced that in August 2013 the hacker attacks, there may be more than 1 billion Yahoo user account was stolen, including the user 's phone number, Birth date and security issues;

In September this year, another hacking incident, at least 500 million users of information theft.According to the US Commercial Insider reported that in August 2013 the hacker attacks may be the history of the largest hacker attacks.Yahoo said on Thursday that it could not identify the September hacking operation, but two incidents may have been made by the same organization.