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I think the caveat (in regards to geocities anyway) is that a lot of sites on there were made years ago, and likely not maintained, which in-turn may be the case of the people that linked to the sites.
As for other domains, any that contain a year < 2011 might be a good shout. There are plenty domains with savvy setups that get a lot of the decent domains mind you.
In the specific case of geocities: Is it even worth it?