That several hundred million people claim is a hoax. It's part of the reason for Vic's departure: instead of actually increasing engagement of Google+, he forced top performing google properties like YouTube to integrate Plus, just so he can claim a portion of YouTube traffic as google+ traffic. It's the kind of shit only an exec from Microsoft would pull.

To date Google+ hasn't actually released a clear engagement metric such as how many people have made a post in the past 30 days.

Note: There's a reason supermarket chains produce their own, knock-off brands of soda that are cheaper and taste mostly the same as the brand-name. And it's not because nobody buys them.

You're proving me correct by arguing that Plus is equivelent to Supermarket cola. That's an epic failure for google. They launched Plus to become a competitor to Facebook the same way Pepsi competes with Coke. You're conceding that Plus is no Pepsi - and that makes it as good as dead.