Privacy, Secrecy, Confidentiality.... It all a bit much for me.
Why would anyone want to keep their previous address a secret now if it was known ay the time? or did they not allow post or any visitors?
Maybe I'm an exception in being an open book! Or maybe I don't understand because I've never had anything I needed to keep secret or anything anyone would want from me.......
I suppose your willingness to expose everything about yourself doesn't extend to your bank account ?
Unfortunately, there are people in this world who make a living by stealing from others, and the amount of data that you can collect about an individual using just a computer and the internet is unbelievable. Most of us are so honest that we don't even give it a second thought. Now, Guy tells us that when you are asked for personal details, you should not tell the truth, but thousands do.
Do you use the same passwords for every site you visit ? Even the ones where you may have logged credit card numbers ?
Do you use the name of your spouse, or a family pet as a password ?
These questions are all rhetorical, by the way

A while ago, I decided to see whether I could track down a few friends from my teenage years (nearly 50 years ago !) using only what I knew about them at the time, and using simple tools that anyone on the internet could use. I started out with a girlfriend from 1964 - I knew the town where she lived (I didn't remember the address), but I didn't know her DOB, or her parents' names.
Within an hour, I found the following....
A reference to her birth certificate.
The date of her marriage.
The full name of her spouse.
The number of children she had, and their names, and references to their birth certificates.
The address that she was living at in 2006.
What her spouse did for a living.
The value of their house.
A picture of the house.
Their phone number.
A picture of their car parked in the drive, model and colour (no number plate visible).
All of that, using resources available to anyone on the internet. That was in an hour, without moving from my chair. (She was actually living about 80 miles from where she was when I knew her, so it wasn't a local search). I don't intend contacting them, incidentally.