I don't think there has ever been a human society in which people took "personal responsibility" in the sense you are using the phrase. I don't think it's humanly possible for even the smartest person to keep track of their personal data given the quantity of it, the multiplicity of tracking mechanisms, and the uncertainty about how it all works. Not to mention, even if we all read all the agreements we click through, that doesn't mean they are all accurate, sufficient, legal, or adhered to by the authors.
As I wrote in another thread, I have used LinkedIn for a long time, and I have never wanted it to spam my contacts, so I have always had it foremost in my mind to click "No" whenever it asks to import them. Yet at some point, it did it anyway, because it asks me if I want to connect with people who are only email contacts and not on LinkedIn.
Now if you had complete logs of everything I did with my phone and computer, you might well be able to prove in court that I inadvertently gave permission at some point - perhaps I didn't read all of the legalese on something, or perhaps my finger slipped and I forgot.
I can't imagine I would find anyone at LinkedIn who cared about figuring out what happened, regardless.
There is something perverse, in my view, in appealing to "personal responsibility" of individuals dealing with corporations, as it seems to me that the entire concept of a corporation is a way for people to work together as an entity without taking personal responsibility. The reason we have corporations is because it's impractical for people to be held liable for their screwups.