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The fresh tag is a big chance for "short-time" spammers.
It reminds me of Dow Jones and daytrading.
It's interesting to see how some people can still do huge Google spam, being caught and then do it again with a new set of domains. Never ending spam game ;)
Also, precisely how are you defining "spam"? To me as a user, if I run a search for purple penguins and a bunch of porn sites are on the SERP, I call that spam. However, if I search to buy widgets, and the sites that come up high are widget sellers, then to me that is relevant. What those selling widgets consider spam, and those buying them consider spam, may be different things.