Google's Matt Cutts recently tweeted that people should fill out a form to report post-Penguin spam. "We're reading feedback," he said.
https://t.co/di4RpizN and add "penguin" in the details. We're reading feedback.To report post-Penguin spam, fill out
Cutts indicated in a Twitter conversation today, that Google has read and processed almost all of the Penguin spam reports:
@Penguin_Spam yup yup, we've read/processed almost all of them. A few recent ones left.
On the other side of the equation, if you were hit by the Penguin update, and think this may have been an error, Google has a form for that too.
In other news, there's a Twitter account for Penguin spam.