Signed up for FB with a fake account to do a client job. No friends or anything. Every couple of days, they send an email with random people I might know. Never heard of any of them. Got sick of it, so I signed in to cancel the notifications I'd missed. They sent me a "welcome back" notification because I'd signed in. Deleted the account.
I'm in a similar situation - 0 friends because I just follow some NGOs and use the API to provide FB login for some pages. I get notifications almost every day and the "unsubscribe" link leads to a page that lets me opt out of the notification type: "Updates about your friends since you logged in", while my notification settings show that I get no Email notifications at all.
So that's the price I pay for allowing FB login on some of our pages.
