The Circus Historical Society is on FACEBOOK. You might not be a user and don't have to be to see the Facebook page.
Anyone can go to www.facebook.com/CircusHistoricalSociety You'll see the page and any and all comments. You'll have to login to Facebook to make any comments however.
The CHS also has a group page with over 1000 members in the group that had some rather lively conversations the last couple days. You will need to be logged onto Facebook to see the group display.
There is another terrific source of circus history with some photos you may have never seen before. You'll discover the group at http://www.facebook.com/groups/108709063580/