From the SEW article:
The threshold isn’t the same for each domain. Links seem to cause some difference.
The link issue has been the same for almost every Google update over the past five years. Lots of quality links appears to overcome the threat of penalties.
We ended up with 50 separate domains. None of them could be linked to each other through signals like ownership, hosting, Google accounts, or link partners.
Wow! This was not a simple test.
It is also interesting that they observed that a page was either hit by Panda or it was not. There weren't any "degrees" of penalty applied.
You can have it fast, good or cheap. Pick any two.
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