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These attempts appear to include a large amount of data obtained from one or more compromised lists from other companies, sites or other sources.

Any guesses as to where the original list of usernames and passwords may have come from?

I'd guess a forum hack. Most users use the same password and it's mostly kids who couldn't care less about password security.

I think the parent post is referring to the various Sony hacks that occurred earlier this year.

True, my mistake, sorry.