Apple has told a prominent blogger that about 400 iTunes accounts were compromised during the recent rash of hacks that were used to boost sales of one developer’s apps. Clayton Morris, blogger and co-host of The Grizzly Bear Egg Café podcast, says that Apple responded to an earlier inquiry of his, claiming that only 400 of the 150 million iTunes users—less than 0.0003%—were impacted by the scam. Apple also said that the iTunes…