A few months back I started getting notification emails from what was obviously an ongoing chat from some forum -- not FSM -- although some of the participants were recognizable from this forum, and occasional references were made to it as well.
It wasn't creepy...the subject was actually kind of interesting...but I had no idea how I suddenly got 'opted in' to it. And no 'personal' contact was attempted, it was just sort of like overhearing a random conversation.
Eventually the email/notifications just stopped, and I didn't pursue it any further.
Yours sounds a little weirder, although electrons sometimes can get crossed. Still, I think -- like you -- I would 'pass' unless it came as a PM.
(The only other thing I could suggest is that our stuff anywhere on the web can sometimes get copied onto sites like Pinterest...apparently by somebody who just liked the pictures...with [in my case, at least] no contact, no permission, and no credit other than [sometimes] just to the original website, but to no author or builder.
(Maybe somebody scoped one of these second-hand pics, and didn't know how else to get in touch. Just a thought.)