Not that I completely disagree with you, but lets not pretend that leaking SSN is equivalent to possibly leaking emails and passwords. One of those is far more important than the others. There was also tons of evidence of insider trading by Equifax execs. If anything the Equifax stuff proved to me that the American public doesn't care about privacy and so neither should investors.
Email password, of course. I give out my ssn for identification to various organizations. I NEVER give out my email password to anyone except my email provider