Tweetchats, in case you’re not familiar with them, are single-topic discussions conducted over Twitter with the use of a hashtag that defines the theme. Services like Twubs and Tweetchat.com make it easy to see only the tweets from the chat.
The first tweetchat I remember was conducted by Israeli consul for media and public affairs, David Saragna, during the Gaza conflict, with Saragna and members of his staff engaged in a Q&A with anyone who was interested.
Since then, the M.D. Anderson Cancer Center has conducted tweetchats on cancer risk, cancer and heart health, and smoking cessation. The United States Geological Survey has conducted tweetchats, as has Health Justice CT, Cisco Systems, and Uden’s Gluten Free Foods (with a chat on Celiac Awareness Day), to name just a few.