I think, though I'm not sure, that if you are using a "standard" guestbook that you are probably targeted by automated bots posting junk messages to see if your guestbook is "open" for spamming.

I don't think they get anything useful out of the post or the link, other than perhaps a once in a blue moon visitor who might follow such a link. If there are many thousands of spammable pages then it might be worthwhile to them as it costs essentially nothing.

Thank goodness for image verification!

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