PearlJam on 12 October 2011
This isn't Sony's fault. What most likely happened, some forum, VG site or blog was hacked into. Many times people link their GamerTags and PSN IDs to these accounts, and naively use the same name and/or password that they use for PSN or Live. This is probably what lead to the 60,000+ Live accounts that were leaked a few months ago.
Remember the Epic and Bethesda forums getting hacked into? Stuff like that, and tons of other random VG related websites. Just go on there and you can see that tons of people link their PSN and Live IDs, I'm guessing at least a few use the same name and pass for multiple things.
