http://www.teachthought.com/social-media/8-ideas-10-guides-and-17-tools-for-a-better-professional-learning-network

This site has 8 Ideas for starting a PLN, 10 Guides how to start a PLN and 17 tools for a better PLN.

This isn't exactly an article that was required or being looked for, but it had so much information I had to include it.