My GD.net profile page doesn't list my email, except to people logged in as moderators... but one day I got a personalized email from a google HR representative asking me if I'd like to apply for a job, and they referenced posts that I'd made on this board!
They definitely know
a lot about everyone.
On topic, but regarding Facebook --
Maybe 5 years ago, I signed up to Facebook with a fake account in a fake name (
"Bill"), with an old email (
also made under the same fake name,
which I use for things that might spam me), because I was going to an event that was being organized on there.
Recently, Facebook has started sending emails to this address trying to entice me to start using this long-idle account. The scary part is, most of these emails are in the form of "
Hey Bill, do you know *person*, *person* or *person*?", and I shit you not, about 50% of the people it lists I've never heard of, but the other 50% are either high-school friends, university friends, colleagues (
past and present -- from every different job I've ever had), current close friends or even family.
I've not logged into that account for years, and somehow, it has a really good idea of the institutions and workplaces that I've attended!
thinking about it, you'd essentially be able to discover what site's are selling your email to advertiser's.
For anyone with gmail, I'd recommend you do the same thing to catch out people who on-sell emails.
You can add "+anything" to the end of your email address, and it still goes to the same gmail account.
e.g. if you're "bill@gmail.com", you can sign up to gd.net with "bill+gdnet@gmail.com" and you'll know they've on-sold your details if you get spam to that address