Following my post Intelligent Knowledge Management, taking issue with @snowded's "knowledge sharing" agenda, I have read a few more pieces about knowledge sharing, including Patrick Lambe's piece If We Can’t Even Describe Knowledge Sharing, How Can We Support It?. See also Mark Gould, Knowledge sharing: it may not be what you think it is.
Patrick describes a person with a life-critical illness, being told stuff by various healthcare professionals and others in what he describes as "a series of encounters with intersecting knowledge worlds", and has drawn a good diagram of this process. Patrick seems to regard it as a complex example of knowledge sharing. But in what sense does this count as sharing? To me it just looks like communication - translating specialist knowledge into accessible information.
In many contexts, the word "sharing" has become an annoying and patronizing synonym for "disclosure". In nursery school we are encouraged to share the biscuits and the paints; in therapy groups we are encouraged to "share our pain", and in the touchy-feely enterprise we are supposed to "share" our expertise by registering our knowledge on some stupid knowledge management system.
But it's not sharing (defined by Wikipedia as "the joint use of a resource or space"). It's just communication.