|Techniques to Avoid|
In the search engine world, spam is defined as the manipulation of a web page to give it an artificial boost in the search engine rankings. Generally, spam is what the search engines say it is. I.e., it is defined by the search engines themselves. Each of the major search engines provide specific guidelines describing what webmasters should and should not do to their web pages in order to achieve a better search engine ranking, though that has not always been the case. Several methods are universally deemed search spam, including:
We recommend not using the above listed unethical search engine optimization techniques. For engine-specific guidelines, visit the search engines themselves.Google - Report a Spam Result
Suffice to know that search spam might sometimes work for a while, but sooner or later the search engines will work out such unethical, get-rich-quick techniques and then blacklist you from their results.
Once blacklisted (or sandboxed) it is very difficult to rebuild your reputation with the search engines again. So, avoid these manipulation techniques completely or be prepared to have your online business collapse.