There are also other Social Media Networks for Educators. You may want to explore these as well as they each offer something different to add to your PLN.
LinkedIn is a Professional Networking website. You can connect and network with other professionals in your field. Your profile basically becomes an online resume.
Teachers Guide to the Use of LinkedIn: http://www.educatorstechnology.com/2012/05/social-networking-part-3-teachers-guide.html
Edshelf.com - "edshelf is a directory of websites, mobile apps, and desktop programs that are rated & reviewed by parents & educators, for parents & educators. We help you find the right educational tools for your specific needs."
Classroom 2.0 - "A social network for those interested in Web 2.0, Social Media, and Participative Technologies in the classroom. We encourage you to sign up to participate in the great discussions here, to receive event notifications, and to find and connect with colleagues. We have over 70,000 members from 188 countries!"