I have a Facebook account. About 4 years ago I registered on Yahoo to use Yahoo Answers. I entered entirely fake details. I check my Yahoo email very rarely, maybe once a year.
When I checked today, I see a bunch of spam messages from Facebook, around 300 since June 2012 with 100 in only the last month, titled “Do you know MY_REAL_NAME? Get on Facebook now and add as a friend.”
My question is how does Facebook know about my fake Yahoo account and its email address? I have never shared my Facebook details on Yahoo and likewise never shared my fake Yahoo account details on Facebook.
Also, in some of the messages I get another 9 random strangers listed in the email beside my name with the same ”Do you know X?“ message, mostly girls.
The sender is update........@facebookmail.com and all the links point to facebook.com there is even an unsubscribe button that opens a page on facebook. It very much looks like to me that they are official facebook emails.