Great question to pose – what makes an expert? What I see happening through my own efforts at blogging and reading blogs in the education sphere, is a potential “flattening” of hierarchial structures of experts. As a humble classroom practitioner, my access is to experts of my own choice and who have information and ideas of relevance to me. I can know interact with them via comments and offer my own insights. You could have a Ph.D but if I can’t access you, I can’t learn from you.