It's a problem we've been having for a while at our news site: someone deletes comments posted by readers.
This bastard doesn't eliminate the comment, he/she just deletes the content of it.
Maybe you can take a look at this sample:

http://larocka.info/index.php?option=com_content&task=view&id=146&Itemid=54

You'll see that the very first comment is deleted, and then many others as you scroll down the page. We've been re-writing the comments, but it's not easy to keep track of comments on all articles...

Can you help us to solve this problem? I didn't find a post about this problem in the forum...

Thanks a lot, your work is great!