There have been some high-profile websites that were hacked with security breaches coming to light over the last few weeks. Two of the companies that were hacked included dating site eHarmony and professional social network LinkedIn. The other social music site Last.fm. Apparently, Last.fm had indication weeks ago that it had been breached yet its internal security audit didn't find the breach.
The company was notified by multiple users according to reports that they were receiving spam via e-mail addresses only associated with Last.fm accounts. The company said that it would start investigating immediately at launch day internal security audit, which apparently missed the breach.