The Selective Mutism Webring exists. Sorry, the webring is only for Japanese websites.
At present about 20 websites, including my weblog The Selective Mutism Journal, are registered. Most majour Japanese websites about selective mutism join the webring. All of them are created by individuals.
http://www.webring.ne.jp/cgi-bin/webring?ring=s5271;list
Index of SM in Japan
