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Claiming that this affects "10% of all Yahoo accounts" or that the breach in June 2012 is related is disingenuous---Yahoo and Yahoo Japan connected in brandname only ("Yahoo" accounts are not valid "Yahoo Japan" accounts, and vice versa).

[shirkey]

I agree -- in the headline, I took the number directly from the article as they stated "[t]he potential data breach affects 10% of Yahoo's user base."

Another article clarifies that the total number of Yahoo Japan accounts as 200 million, so it was actually 10% of all Yahoo Japan accounts. My apologies for contributing to that impression.