Helping people with computers... one answer at a time.
Google+ is Google's entry into the social media and sharing arena. At http://plus.google.com one can share and see what others have shared in an ongoing online social conversation.
Google recently added a black menu bar to its sites and a blue bar promoting Google+. I'll look at what you can and can't do to get rid of them.
Google Talk is a way to talk with other people on their computers. That's good if you want to do it and don't already have an alternative service.