The Save Natural Thyroid Coalition has an active list with more than 500 members on Yahoo.
To sign up, go to the group's home page at http://groups.yahoo.com/group/Save-Natural-Thyroid
To post, after signing up, email: Save-Natural-Thyroid@yahoogroups.com
Save Natural Thyroid Coalition: Facebook Group
The "Save Natural Thyroid" Coalition effort is active, with more than 1,500 members, on Facebook: at Save Natural Thyroid