Invitations to join various communities have greatly reduced the utility of G+ notifications for me.
All of a sudden over the past month or so, I get many invitations a day to join communities that have nothing to do with my interests.
Now I need Gmail's spam technology for my G+ notifications.
Google+: View post on Google+
Just turn off notification for invitations.
That's crazy talk! Â (I didn't realize you could do this)
Hmm.  All I see are options to disable sending such notifications to email or my phone.  While that's valuable, what I use most is the red notification on Google sites, and  don't see a way to turn those off.
Its a shame that people are abusing that feature, because I have been invited to a few really good ones.
I'm sure you can turn it off. I did somehow, and I never ever get any invites (and I used to get a lot). Could it be something like allowing notifications from people not in your circles or something like that?