Drug manufacturers have been coming to grips with how to leverage social media, from Tweets to blogs, without overstepping the bounds of compliance. Johnson & Johnson and a number of companies have taken the lead, as our Senior Editor for Digital Media Michele Vaccarello Wagner has written.

Wish you knew what pharma companies were Tweeting about? Ignite Labs has done us the favor of putting Twitter feeds from all the drug companies that are seriously Tweeting onto one page. Here is Pharma Twitter Feeds.

No one is tracking pharma's social media presence better than WhyDotPharma, and the site/blog has done a nice review of which pharma companies are Twittering the most (Amgen, Boehringer, JNJ, Genentech), and how they're doing it. Some companies are using Twitter to establish a presence and get the word out on corporate news and policies, while others are using Twitter to follow and see what's being said about themselves and the industry.