Thank you for getting back to me.
When I visit my website and the app, using Mozilla Firefox I can post a comment, even if not logged into facebook.
When I visit my website and the app using Outlook Expess 8, I can only post a comment if I then log into facebook.
It appears if I log into facebook using Outlook Express as administrator, not all the comments posted using Mozilla appear on facebook. My concern is can I find a way to delete anonymous comments if they only appear on my website. I seem to need to get rid of history, such as in Mozilla Firefox for the delete to appear. This problems seems intermittant which does make it more complicated!
Kindly have a look at the page in question, and feel free to post any test comments using the app if this helps.