Not sure if this is the appropriate forum for this post, but it appears to be quite a nasty little bug.
A noframes tag in a journal entry causes all content below the tag to disappear. "All content" not restricted to the journal entry where the tag is found. All journal entries folllowing the tag are wiped out as well. Not only does this happen on the users's recent page, it affects any page they are listed on as a friend in a similar fashion. Naughty indeed.