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I am currently writing a chapter regarding open and networked learning. I have used the term Personal Learning Network (PLN) dozens of times over the last few years, and have seen it mentioned countless times in blog and microblog posts, and other forms of media. However, I cannot seem to find a solid reference or definition for the concept of PLN. I sent out several email messages asking people if knew of an existing article or reference for the PLN definition, and I have yet to receive a response. About the best lead I could find was a post from Stephen Downes that mentioned “Dave Warlick has taken the concept of the Personal Learning Environment, renamed it (to Personal Learning Network).”