I love this idea.  It's a college class, but it could easily be adapted to a high school environment.  The back channel in online education provides a rich source for learning.  If this could be implemented in brick and mortar with twitter, then this would be great.

This is a Wiki that documents and allows collaboration between two different classes to answer various questions.  The classes are in New York and New Zealand.  What a great use of a wiki.

This Twitter account belongs to a Principal at Kurt Hahn EL School in Brooklyn New York.  While this may not be thought of as using, social networking in education, I say it is.  Education is not just about classrooms and lessons, it is about about community and parents as well.  Keeping the community, parents, and students up to date on happenings at the school and profiling teachers and student achievements is an important part of education.  This is a great way to use Twitter.

Here are two examples of using Voicethread to create digital and live Art anthologies.  These examples are from 7th and eighth grade.

This is a Voicthread slide show  that incorporated groups solving math problems.  This is a great idea.

This is another good use of a blog.  It's for second grade students and the student work has been taken down, but scope is great.  Exposing students to reflection and blogging at a young age is tremendous.  Hopefully, it starts a life-long journey of writing and reflective, critical, and creative thinking.

This is a teacher's blog that is used to keep parents informed about classroom events.  This is, maybe, an overlooked yet simple and effective use of social networking in education.

This blog talks about Larry Liu, who has successfully implemented Facebook into his class as well as mobile technology.

This blog post outlines an assignment in which students must create a Facebook page for a literary character.  This is a great idea.

This site details how a particular teacher, Steve, incorporated Facebook into his classroom and curriculum.  He gives step by step instructions.  It seems like a good idea.

A Facebook page I created to list some strategies for managing your digital footprint.  

This is a brief but detailed explanation of Bandura's social learning theory.  It summarizes the theory and helps to make it understandable.

A good article on what type of people and tools can constitute a PLN.  It gives some good examples and provides some great tools that could be included in anyone's PLN.  It embeds a youtube video in it that enhances my understanding of a PLN.  It also helps me to differentiate between a PLN and a CoP.

This is a video discussion as part of a online course on connectivism.  Taken by itself, it is a little obscure, but taken in the context of EDTECH543 and in an attempt to understand connectivism, it was immensely helpful to me.  The video centers around the nine dots puzzle and the how the solution to it is a perfect example of connectivism.

This is a decent video of a discussion between two professionals who discuss CoPs.  It defines a CoP and gives examples of what might happen in a CoP.  It is informative and helped me understand the difference between CoPs and PLNs.  

This slide share touches on what social learning is.  It suggests that people learn a great deal of information on their own and in their own manners--sometimes just by talking to others.  It focuses on the need for a tool or web software that promotes social and informal learning but still takes into account data privacy and security.   

While this site leans towards the how-to aspect of a PLN, I found it illuminating simply for the fact that the students described in this article create a PLN for each project.  It emphasizes the fact that a PLN is personal and not the same for everybody.  PLNs are personal, can be permanent or temporary, and exist for the sake of the person to learn.  

This article is fairly specific.  It helped understand the difference between a CoP and a PLN.  Primarily it talks about what learning is and how a PLN can help and how learning can come in a PLN.  It elaborates that a PLN is something that we have.  It is our connections that we make and, while not explicit, it emphasizes that we feel ownership in the PLN.

This article very clearly defines what connectivism is.  It goes over George Siemens theory in detail and how it applies as well as how it is different from other learning theories.  It has some real-world examples.

This is a more technical site that better describes CoPs.  It talks about what a CoP is and what the requirements are.  I particularly like that the it states that the learning is not necessarily the primary reason for the existence of a CoP.  It also gives some sources for further study.