joined:Dec 7, 2009
My main website is about 10 years old, it was hit by penguin (negative seo) in 2013, then partially recovered.
www is the main website (italian), then I have two subdomains (russian and spanish version) which may suffer a Panda penalty because of thin content and poor written pages.
My question is: can subdomains influence main website rankings? Can a subdomain hit by Panda (or Penguin or other penalties) cause some effects to the main website and to other subdomains?