And then shortly after that, having learned nothing, they started hunting down and banning accounts that appeared to be for businesses, since their "Google+ for business" offering wasn't ready yet. By the time it was, nobody wanted to put their business on Google+ anymore.
Finally, after it was already dead (but they didn't seem to know it), they subverted the rest of their business to try to drive users to it - mandatory Google+ account integration, killing any product that tended to compete with it, etc.
Google+ is the demarcation between the old Google that consistently did amazing things and the new Google that, well, mostly doesn't.
I looked this up years ago and got blog posts explaining it. All I get now is page after page of recipes for homemade pot pies. You'd think after a while some logic would spin up to say "I bet this isn't what they're looking for! Let's try something else." It used to do that.
Google + Evil