Along with Snapseed, Google also introduced Communities into Google+, this morning. Communities, as the name suggests, are more permanent groups of people with common interests that you can join and be an active part of. You can share ideas or thoughts, join Hangouts with fellow group members, plan events with them, and even +1 things from across the web, right to the group. It’s a much easier way to converse with like-minded people than the old way, which was spending hours upon hours finding interesting people and then creating a Circle.
Also, Google announced that more than 500 million people have “upgraded” to Google+, that 235 million people come close to interacting with it because they use other Google products, and that 135 million are actually active in streams.
Via: Google Blog