Hi,
I work for a major online newspaper, and recently, several of our yellowpages sections took a dramatic hit overnight, only in Google rankings.
The listings are hosted not on our domain, but the remote domain. We CNAME them using yellowpages.ourdomain.com.
For many years, these pages brought in a good amount of natural traffic.
About 2 weeks ago, we simply added a Local.com widget that included text links to these pages. (Example: Electricians Plumbers, etc).
Since then Google referrals have dropped 90%.
As far as I can tell all <title>, <h1>, canonical, and URL data has remained exactly the same.
Has Google started penalizing directory listings like these as duplicate content?