Google Plus was one of the attempts by the American company to lay the foundations of a social network that would rival Facebook. They pushed the application on all Android smartphones, tried to bring them various tips & tricks, search integration, etc.
The results were not as expected by Google, and I am now preparing to close Google Plus for the general public. I understand that a version developed for companies will remain in place and will receive new features in the future.
The bottom line is that Google is shutting down its social networking attempt after it discovered that certain information had been accessed by third-party applications through a leak in the Google Plus API. Data that was not made public (name and surname, e-mail, occupation, sex and age) were accessed. They say that the data from the posts were not visible. They discovered this in March 2018, but did not inform anyone until recently.
They preferred to shut down Google Plus instead of keeping it on its feet. Now I don't know when it will take effect, I can currently access my profile. I noticed that there were people who gave me + the posts I uploaded from the site, an activity that was still small there. On this occasion I discovered that I had 3839 interested people. :)
The only product that Google closed and I regretted was Google Reader. Luckily, Feedly has appeared in the meantime and is successfully replacing him. I'm sure they won't shut down Gmail, Docs, Photo, and YouTube, and I'm not worried about other solutions.