Why Google+ Failed (onezero.medium.com)
Google Plus didn’t fail because Facebook is invulnerable.
It failed because of deep flaws embedded in it from the very start.
It’s no news that Google is shutting down its products or services. The author worked in Google+ team and has seen how Google+ end up being one of those. He not only told us the issues and problems that caused the failure, but also what prevented it from being fixed or corrected along the way from product perspective.