The relation between knowledge sharing and distance

Just came across this intresting article:
Joy London at excited utterances repeats some interesting reader comments about human behavior and knowledge management. Keep Your Knowledge to Yourself?

One of the principal impediments to participation is the time and effort necessary to compose, edit and refine a contribution for internal "publication" so that it can be clear to all potential readers. If you post a note about your specialty (e.g. your practice) for your own use, it can be short and cryptic. If you know that only trusted senior members of your practice group will see it, you may be a little more thorough, but you still have confidence that others of equal experience will understand it.