I'm not certain where to start. This type of spam is very interesting because they are using Google+ to send the spam. I get hundreds of this type of spam on a daily basis, and not exactly sure how to remove it or where it is coming from or how they gained my email address.
There is options to unsubscribe from those emails, or to "Mute" them. However if you unsubscribe than they will still spam your inbox. You can't "mute" them either because the post doesn't exist. So basically there is no way of stopping the email spam.
Do you think Google will do something about this? Do you know of any tricks to remove all this Google+ spam?