Medical education around the world, a map by Anne Marie Cunningham: Add yourself so we can find people interested in medical education from all around the world.
Look at this short video for guidance on how to edit the map: http://www.screenr.com/vU2s
Here is a list of Healthcare / HCSM / HIT Social Media-related accounts around the world.
This is a list of the Top Twitter Doctors arranged by specialty in alphabetical order - feel free to add your own suggestions. The list is open to anybody to edit:
For doctors: How to be a Twitter superstar in two easy steps