Facebook – How to prevent certain Facebook friends from sending you Inbox messages

It appears there's no way to do this, unfortunately.

What I ended up doing was to do the going-forward arrangement, and then work back a couple of months, making corrections manually (#1). Better than nothing. There is also the issue of my comments on others' posts being visible. In my case, I think this is "good enough", though I do wish there was a better solution available (without programmering).

It might be possible to use the Facebook API to achieve this, but I didn't see anything ready-made with some quick searching.

I should note that if someone adds JUST him and gets these emails. Much like he set up the "Bob" account. They would only receive emails about friends on HIS account. Since he'd be their only friend it would be rather obvious wouldn't it? I'd say it's a problem with facebook's privacy for sure.