Stephen downes

In the case of informal learning, however, the structure is much looser. People pursue their own objectives in their own way, while at the same time initiating and sustaining an ongoing dialogue with others pursuing similar objectives. Learning and discussion is not structured, but rather, is determined by the needs and interests of the participants. There is no leader; each person participates as they deem appropriate. There are no boundaries; people drift into and out of the conversation as their knowledge and interests change.


http://halfanhour.blogspot.com/2008/11/future-of-online-learning-ten-years-on_16.html