chris
Top Contributor
This comment by a reader sums the short article up nicely:
Google Recommends Not To Host Bad Sites On Your Domain Name
Cheers,
Chris
I think it is final, solid proof that ANYTHING on any subdomain attached to your domain can affect your rankings.
This might seem obvious, but for a long time the "common knowledge" has been that subdomains are treated as their own separate entity. This shows that it's not true.
Google Recommends Not To Host Bad Sites On Your Domain Name
Cheers,
Chris