CB Activity display to non-logged in visitors

Hi, apologies if I am missing something obvious, but I would like the CB Activity to display to non-registered, non-logged in visitors to my site, so they can see the activity 'feed' with a view to them registering and joining in. I have everything set to 'public' as far as I can see but if you go to the site as a visitor it just says "No posts to display". As soon as you login everything pops up OK. Thanks in advance. Rick.

I have found the source of my problem through ticket #342611 which says : "Activity streams themselves should already be public access, but if the stream contains profile activity (e.g. profile.USER_ID) and profiles aren't accessible to the public then the public cannot see that activity."
I went in and made the Configuration > User Profile > Profile View Access Level = "Public" and everything shows up fine.
No further action needed thanks.