Neither Facebook nor Google got the ‘friends’ management system right…
It’s too much hassle to manage lists, circles and whatnot.
Google has to move to a concentric circles system.
Family at the centre, then friends, then acquaintances, then following.
You wouldn’t need to choose multiple groups to share with or put people in more than one groups. Viewing rights would trickle down.
And you could create communities the same way, with admins in the centre, then publishers and finally viewers.
Then if some people belong to multiple concentric circles, then you would need to manage that, unless Google adds the much needed functionality of subscribing to public circles.