Google's social network that shut down in 2019 was Google+.
Google+ launched in 2011 as the company's major attempt to compete with Facebook and other social platforms. It organized users through features called Circles, allowing people to sort contacts into groups such as friends, family, or colleagues. The service also connected closely with other Google products and supported features including Hangouts and communities.
Although Google+ attracted substantial sign-ups, it did not achieve the everyday cultural reach of Facebook. In October 2018, Google announced plans to shut down the consumer version after identifying a security vulnerability that exposed private profile information to third-party developers. Google later moved the consumer shutdown date to April 2019.
The service continued in a business-oriented form for a time under the name Currents, but that product was also eventually discontinued. Google+ should not be confused with Orkut, an earlier Google-owned social network that was shut down in 2014.