By Barry Schwartz at Search Engine Land
Six months ago, Google delisted all sites on a co.cc domain name. Today, they seem to have all returned.
A search for [site:co.cc] currently returns 105,000,000 results.
Google originally delisted the co.cc subdomains because Google saw a “very large fraction of sites” on that subdomain to be “spammy or low-quality” and felt it was warranted, in this case, to simply block the whole subdomain from showing up in Google’s results.
I am not sure if this change was intentional or a bug where after we write about it Google will delist the subdomains again.
Here is what the results looked like previously:
Now that many of the results are back, you can check for yourself to see how spammy or low-quality co.cc sites are or are not.