Check out this SlideShare Presentation on ten social media efforts by the pharma industry. It gives a good overview of the topic.
But this is just a drop of what is the fast expanding world of #HCSM ie health care social media.You can see a complete list of all pharma and healthcare related social media efforts on a wiki maintained by @jonmrich on Dose of Digital.
Also, currently we have the 1st Annual Dosie Awards happenning, and voting on the best social media efforts in the field of healthcare and pharma. You can vote by clicking here.