I'm working on creating a Robin Hobb Fans Twitter List. I've added all the people from the forum that I know are on Twitter, but that's hardly a complete list...

As far as I can tell, there is no other Robin Hobb fan list on Twitter. You can find the list at http://twitter.com/chrischaeffer/robin-hobb-fans

Let me know if you want added.

There's also skittledog's "hobblings" list - I think it's mostly regulars from Willem's board as that's where the nickname hobblings originated (I believe).
http://twitter.com/skittledog/hobblings