It's true that Max may know, but virtually none of the rest of us do.

The "GUEST" postings can be divided into the innocent: nonmember overlooked the name slot, member away from his regular PC is not in the habit of filling in name, etc.; and the suspect: someone intentionally leaves the name slot blank to have anonymity on the forum (even if not to Max) and to be able to disclaim any other "GUEST" posts. Not all intentional anonymity is malicious or for unwholesome reasons, but apparently a fair portion of it is. Some postings are fairly easy to classify as innocent or suspect, others are not so obviously one or the other. And I suspect that some "GUESTS" don't give a rat's butt and couldn't be bothered to type the extra characters.