Google Search for Spam Websites

How Google Search for Spam Websites and what it does with them.

 

Google have announced that they are fighting spam results, to keep your search results relevant.

They are checking for:

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Hidden text or keyword stuffing

Some of the pages may contain hidden text and/or keyword stuffing.

User-generated spam

Site appears to contain spammy user-generated content. The problematic content may appear on forum pages, guestbook pages, or user profiles.

Parked domains

Parked domains are placeholder sites with little unique content, so Google doesn’t typically include them in search results.

Little or thin content no added value or user experiences

Site appears to consist of low-quality or shallow pages which do not provide users with much added value (such as thin affiliate pages, doorway pages, cookie-cutter sites, automatically generated content, or
copied content).

Unnatural links to a site

Google has detected a pattern of unnatural artificial, deceptive or manipulative links pointing to the site. These may be the result of buying links that pass PageRank or participating in link schemes.

Spammy free hosts and dynamic DNS providers

Site is hosted by a free hosting service or dynamic
DNS provider that has a significant fraction of spammy content.

Cloaking and/or sneaky redirects

Site appears to be cloaking (displaying different content to human users than is shown to search engines) or redirecting users to a different page than Google saw.

Hacked site

Some pages on this site may have been hacked by a third party to display spammy content or links. Website owners should take immediate action to clean their sites and fix any security vulnerabilities.

Unnatural links from site

If Google detected a pattern of unnatural, artificial, deceptive, paid or manipulative outbound links on this site. This may be the result of selling links  or participating in link schemes.

It’s not as fancy but i dont work for Google.
Taken from  http://www.google.com/insidesearch/howsearchworks/thestory/index.html