For the e-mails I'll have to check. I think they were "opt in" to begin with in the past but I could be wrong, I'll get back to this.
Anything you write is still public and can be used against you, however your personal data can and has to be removed when you wish it so, although I'm fairly sure that when they're talking incriminating behaviour you can't really counter sue for privacy breaches when the incriminating behaviour was public to begin with.