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Perren - I can't be certain it was Penguin, but the timing of page shifts coincided with Penguin 1 & 2, and yes, penalising on the basis of backlinks makes negative SEO easier (there have been a number of posts in earlier threads on this).
[edited by: mhansen at 8:53 pm (utc) on Oct 8, 2012]
[edited by: martinacastro at 9:11 pm (utc) on Oct 8, 2012]
I think these slight drops were due to a devaluation of low-quaility backlinks.
a devaluation of low-quality backlinks that cause small ranking losses.
Hmmm - why do you think that would that need to be part of Penguin when it's already something Google does anyway? I'm not saying it isn't, mind you, but it would be kind of a "double indemnity" thing, right?