On Thursday, a security firm reported , despite the fact Sony is adamant that and is therefore unusable. Sony also said there's "no evidence that credit card data was taken."

Meanwhile, , with the House Committee on Energy and Commerce sending a list of questions to Sony chairman Kazuo Hirai (), and demanding answers by May 6. Additionally, the NextGov website claims .

It's hard to argue the credit card frauds are anything other than coincidental. PSN boasts 77 million users worldwide and not all of them will have registered card details on the free service. However, to give an idea of scale, 77 million people is more than the population of France and Belgium combined, or a quarter of the population of the United States.

In other words, a significant percentage of PSN users are likely to be hit by fraud every day via unrelated causes, and it's easy to pin the blame on Sony.

Although it's said that , there is no indication which of the 77 million users would be affected. Therefore any PSN user who handed over credit card details is probably feeling a little twitchy.