Glenn:

Which surveys are you talking about? I’ve looked at twenty of the more people fear type, and last month I blogged about how public speaking only was at the top of the list in six of them. However, it is at the top when you consider social fears only. See:
http://joyfulpublicspeaking.blogspot.com/2012/10/either-way-you-look-at-it-public_23.html
and
http://joyfulpublicspeaking.blogspot.com/2012/10/accountemps-survey-reveals-workers-are.html

Richard