If you've spent your life naively polluting the dataverse with your detailed life story and now decide to take your personal data security more seriously, how do you find out what data is out there and get people to delete or amend it?
Getting a company to update your details with something fake is probably the best you're going to do, assuming you can find the particular company with your data in the first place. In many cases, this won't be an option, because current, correct data is required. For instance, if you try to list a bogus name and address for your credit card, that's not "protecting yourself". I'm pretty sure it's credit fraud, in fact. As long as you have that card, you're going to be giving away purchase data to your bank, and there's really nothing you can do to protect yourself from that, except to cancel the card.
The point is, data safety is much more than not sharing certain details on Facebook, although that matters, too. Real data safety looks a lot like being a spy on the run - using disposable and fake details for everything, and refusing most of the modern conveniences like paying bills online, being on Facebook, reading your email in any kind of normal way or having a mobile phone.
Mokalus of Borg
PS - You are, in general, much less private and secure than you think.
PPS - This is why so many people feel powerless to stop Big Data.