OK - - my son designs virtual memory systems WORLDWIDE (companies like Chase Morgan Bank, Bank of America, the NFL, New York City, Travelocity, etc. I asked the question about the need to change my passwords and here is his reply:
" There was a centralized datacenter that was hacked from what I understand and they really don't know what was taken or obtained so it's more of a proactive e-mail in case your password has been compromised. Hard to tell if its necessary or not. I would cover the big ones like your credit card site / eBay / etc. Basically anything that has your credit card info accessible."
I ALWAYS trust what my son says. He is not just a typical kid (he's 31 years old) who is computer savy. He is the real deal and certified in stuff that I don't pretend to understand.
So a word to the wise.