Ah, Geocities - that brings back memories: I had my first homepage on Geocities, back in 2000, before I had my first own domain ... sigh
Of course, the reason I mention Geocities here is a completely different one: Some idiot is sending trackback spam for pages on Geocities. The URLs are made up of names followed by a two-digit number, e.g. GarrettBuck31, LewisShannon83, DonnPotter77, etc.
The text of the trackback contains a headline scraped from the site he's spamming. So on this site, for example, I'm seeing spam that includes "Trackback spammer (2nd update)", "Nasty trackbacks", etc. How fitting ...
The title of the trackback spam usually contains the words "adult cam", and that's what it's for: The Geocities URLs redirect to wellcams.com and include an affiliate ID (877:1), so it's probably some amateur spammer trying get some money from those.
The good news: Many of the Geocities URLs don't work. So either their abuse department is after them or the spammer is using non-working links (wouldn't be the first time). And, of course, none of those trackbacks make it through.
Dear spammers: Trackback spam is dead. Get used to it.