Yes, you can use Google+ to do "Facebook" stuff. Friends are "Circles", that sort of thing. But if you are using Google+ for that, well, just stay with Facebook. Google+ is for exposure.
If you intend to use Google+, post everything publicly. It's part of Google, so what you post gets quickly indexed into the Google search engine. And if you want to be known, for example, as a leading expert on dachshunds, Google+ is the place to be.
I listen carefully to my clients. If their concern is privacy, I steer them away from Google+. If they are interested in building their business and reputation, helping promote their website and their blogs, then Google+ is the place to be.
This is what I suggest: if you can't, or won't, hire someone like me to show you how to set up your Google+, then stay away. Done correctly, it can greatly enhance your reputation and your SEO (Search Engine Optimization). Done incorrectly, well, let's just not think about that.
If you're already on Google+, you already know this.