Google+ is Google's social network. I use it to connect to other educators, IT directors, EdTech personnel, tech companies and edtech groups. It's easy to use and has more features than other social networks.
Here is a great cheat sheet with shortcuts and tips for using Google+. Take a look and try some out.
Google Plus - tips for using in education, facts and data infographic
Google+ and Google+ Pages - great for educators and schools
10 Ways to Use Google Plus in the Classroom
Teaching with Google Plus - tips and resources
Twitter, Google Plus, Facebook - a nice comparison
Google Plus now open to Teens, with safety features