Google adds site-wide, subdomain, and subdirectory penalties
Looks like Google has added site-wide, subdomain, and subdirectory penalties to what look like spam pages to Google. Simply put, if it seems too concentrated with keywords and keyphrase, or too unnatural in its language, Google will penalize you (assuming you’re a spammer) for it.
Of course, some legitimate webmasters will also undoubtedly get hit, and they’ll have no idea, as they’ll never see it in webmastertools.
SEOBook has a fantastic summary of the current situation.
In Google we trust?
