Kevin Clash is on Facebook but I wouldn't recommend adding him, he only had a few friends, mostly family and SW employees. So I'm assuming he doesn't want any fans friending him.
Tyler Bunch is on Facebook, too, but I'm actually kind of scared to friend him. I don't know why, but maybe it's from when I met him a few years back I'm not sure if he'll remember me (I was the kid who helped him perform that live-hand Anything Muppet at the Museum of Television and Radio a few years back).