Why do we lecture?

The video lecture below is from Rhona Sharpe (@rjsharpe), the Head of the Oxford Center and Learning Development and Deputy Director of the Directorate of Human Resources at Oxford Brooks University. It is taken from First Step into Learning and Teaching in Higher Education (#fslt12) — a MOOC which took place last year.
Whether you realize it or not, the use of social media (i.e. Facebook, twitter, and blogs) has found its way into the world of medical students, residents, physicians, and medical educators all around the world. The use of these resources has several advantages versus in-person/print educational tool:

