http://gettingsmart.com/2013/01/20-tips-for-creating-a-professional-learning-network/

This website give 20 tips for PLN's but breaks it down into 2 categories:  10 Tips for using PLN's. (best advice there is having professional and private accounts separated) and 10 Tips for Establishing a Productive PLN. (Using sources such as Twitter, Evernote, Blogging, etc. along with suggestions for each area)