I purchased my domain name 10 years ago the same day .jp became available. (mylastname.jp) At that time, I hosted it on a florida based ISP then moved to GoDaddy and finally last year to GoogleApps.
I created email addresses for my immediate family from day 1. Myself, my wife and my two boys aged 1 and 0 at the time. The boy's accounts where never logged into although there was a secure password set. When I move the domain to GoDaddy, the email accounts did not come over and all data on the old ISP was deleted. Again when moving to GoogleApps the addresses of the boys did not get created.
The addresses are, however, in my address book. Which is hosted to my mylastname.jp account on GoogleApps.
So you'll understand my surprise when my son's name and email address turns up as a 'Person you may know' on Linkedin. How did they get the address? It hasn't existing in a system for over 7 years, and as far as I know, only resides in my address book.
Sure his last name is the same as mine and the email address is mylastname.jp, so there might be a connection there. But the point is, where did they get the address from in the first place? There has never once been an email send from that address.
The other concern is that his name and the full email address was clearly shown on screen. What's with that?