A great way to develop an educator's PLN.
As a teaching tool, I'm not so sure....
As a learning tool, however, I am positive that if people can get past initial fears of social media learning, they can find so much information that will help them improve their practice.
How I Use It
I have encouraged teachers that I work with to begin to use Twitter as a way to reach out to other educators in their content areas to get ideas and share information.