Actually, Yahoo has gotten pretty sophisticated, and in some ways overly sensitive. It should not be underestimated. I have two mom and pop sites with the same owner that both got penalized by Yahoo (Yahoo verified that the sites had been penalized) because one of them (the older of the two sites) was involved in link exchanging several years back and then the old site sat there essentially abandonned but not taken down so the old link exchange was still visible. It had a few (non-excessive and topically related) links to the newer site, so Yahoo whacked both of them. The one newer site does well in Google and MSN but in Yahoo, neither site is indexed past the home page. I know the one newer site is clean, because I rebuilt it from scratch, but the second site continues to be held against it. So now I am rebuilding the older site from scratch to get the penalty lifted.
It's a mess, and the sad part is, it was just a couple of innkeepers who had some bad advice from a friend who thought link swapping was a good idea. It wasn't like they were up to anything deceitful...just ignorant and shortsighted.
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