Google's Matt Cutts On Telling If Your Site Was Hit By Algorithm
The truth is, for an experienced SEO, this video sheds nothing new
about the question on determining if your site was hit by an algorithm
or not.
In short, the best way to tell if you were hit by a Google
algorithm such as Panda or Penguin, is to see your analytics and see if you had a major dive in traffic from Google on a specific day. If so, then write down that date, go to...