What feature unique to Google+ lets people interested in similar topics form their own groups?

Question

Quizplus · Accepted Answer

Communities are a unique feature in Google+ that allows people interested in similar topics or themes to form their own groups. This feature lets users form a community around a specific topic where they can share their thoughts, ideas, and opinions with like-minded people. They can also join existing communities or create new ones.

What Feature Unique to Google+ Lets People Interested in Similar