Why call it KM dilemma?

Has known knowledge management for quite a long time. Firstly, I am very excited on this new concept. What a good idea! Share knowledge, this will benefit everyone in an organization. When everyone has same experience, same knowledge, what a huge improvement we can win.
But when I went deeper and deeper, found that there'ere so much things not clear. What's knowledge, what's information, how to share, how to learn, how to distinguish knowledge/information/skills, what km can help us on.
I came here and write down, KM dilemma, let discuss more! I believe that lots of dilemma can be clear after discussed with more experts.