Social Media, while sometimes described as a time waster and blocked by some schools, is actually a great tool for education.
Educators can use social media as part of their Personal Learning Network, to share resources, learn, discuss, connect, and more with other educators around the world. They can also use it to connect and communicate with students and parents, have students connect with each other and share, and so much more. Like any other technology, it's how the tool is used that is important.
Schools and educators should use social media for learning, sharing and communicating.
Here are some articles on how to use social media in education:
Create a Personal Learning Network
Twitter - A great resource for Education
Twitter, Google Plus, Facebook - a nice comparison
Google+ - more reasons it's great for educators
Google+ and Google+ Pages - great for educators and schools
Twitter, Facebook, RSS feeds, Email, Google+ - why/when I use each one
Infographic comparing Facebook and Google+ security
Great poster for creating a PLN with Twitter