According the All Things D, this site called iPhonedevSdk (do not visit this site; it's malicious), is the one site responsible for hacking Facebook and Apple. It reportedly used a Java vulnerability and used code built into the HTML of the site. According to ATD, this is likely responsible for the hacks of Apple and might even be the common thread behind all those Twitter account hacks. (Alicia Keys, did you visit this site?)

The hack is intended to draw users from the tech industry to visit the site and become infected, simply because you won't be clicking on any spam email anytime soon, but you wouldn't mind heading over to an iPhone dev SDK site. Clever, actually.