They are separate for user generated subdomains.
http://www.seomoz.org/blog/understanding-root-domains-subdom...
It is possible that on that fateful day, Google noticed zlio is user generated sub domains, and lost power.
It is possible that on that fateful day, Google noticed zlio is user generated sub domains, and lost power.
subdomains are treated as separate domains, right
If all the subdomains had links back to zilo (say the header or footer), it starts to look like a huge link farm, or a bunch of satellite sites. It's actually pretty dangerous. But disavow is here, right? hah