Every day, millions of useless spam pages are created. And Google have been doing all it takes to fight spam through a combination of computer algorithms and manual review.
Spam sites attempt to game their way to the top of search results through techniques like repeating keywords over and over, buying links that pass Page Rank or putting invisible text on the screen. This is bad for search because relevant websites get buried, and it’s bad for legitimate website owners because their sites become harder to find. The good news is that Google’s algorithms can detect the vast majority of spam and demote it automatically. This is the main reason why webmasters should take note and do not engage in the activities, i will be listing below which will definitely affect their website ranking results or might result in total deletion of such website from search result .
Lists of web spam that can affect your website search result .
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.
Hidden text and/or keyword stuffing : Some of the pages may contain hidden text and/or keyword stuffing.
Parked domains : Parked domains are placeholder sites with little unique content, so Google doesn’t typically include them in search results.
Pure spam : Site appears to use aggressive spam techniques such as automatically generated gibberish, cloaking, scraping content from other websites, and/or repeated or egregious violations of Google’s Webmaster Guidelines.
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.
Thin content with little or no added value : 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 from a site : Google detected a pattern of unnatural, artificial, deceptive or manipulative outbound links on this site. This may be the result of selling links that pass Page Rank or participating in link schemes.
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 Page Rank or participating in link schemes.
User-generated spam : Site appears to contain spammy user-generated content. The problematic content may appear on forum pages, guestbook pages, or user profiles.
Note : If you are connected to Google webmaster tools you can notice this errors and correct them .