i've noticed some of those blank messages, too, but have actually created at least one blank comment by accident myself, and have seen plenty by others, too. (it just involves hitting the "submit your comment" button with an empty comment box!) i just assumed those blank ones were accidents. wouldn't admin just take down the whole thing, not just the time? i have no clue how that works.
the latest i've seen, though, have had a comment followed by the score. not fooling anyone!
i think it'd be super to have someone track my achievements for me, but i think it's safe to say, "it ain't gonna happen!" it would be simple to do in excel (or an excel-type program). i just haven't cared enough to do it.