comments left via fb/twitter/G+ don't post to page

Hi there, on this particular wordpress MS install, Comments Plus does indeed post the comment to the page on the other sites it's installed on. However, on this website: drumcovers.tv it doesn't.

Example page:
http://drumcovers.tv/2012/09/demo-zildjian-fills-monkey-wax/

When I use fb/twitter/G+ to comment, it does indeed post to that social network but the comment doesn't appear on the page. Any ideas?