“Social and informal learning is not the greatest challenge facing learning leaders because they now have to implement it, it is the greatest challenge because leveraging social and informal learning massively increases the impact of any formal programs and is a fundamental building block to developing a learning culture and a learning organisation. ”

Nigel Paine – http://www.nigelpaine.com/blog/social-and-informal-learning-pt-3-of-the-four-greatest-challenges-series/