Without any notable shame, and as a guest blogger on KevinMd. The post was about other physicians can become big-time KOLs by using social media, and refers to another post which indicates that pharmaceutical companies look for physicians who are big prescribers of their products and have a lot of influence to, guess what, help market their products. Although the blogger refers to ethics more than once, how it is ethical to trade on the trust physicians get for their professional vows to put patients first to market products (that may not always be good for patients) remains beyond me.
ADDENDUM (27 August, 2012) - See also comments by Dr Howard Brody on the Hooked: Ethics, Medicine and Pharma blog.