Spiders Don't Eat Spam And Neither Shoud Your Site Or Risk Getting Banned!

Everyone must understand the terms of service of the major search engines. Google’s guidelines are located at http://www.google.com/webmasters/guidelines.html
Yahoo’s best resource is:

http://help.yahoo.com/help/us/ysearch/basics/basics-18.html

and all of the other search engines have similar rules. A few people make a living fooling Google, hopefully you are not one of them. Even if you think you can fool the search engines now, they increase their vigilance every day. Tricky techniques leave you vulnerable to being reported to the search engines by your competitors, causing an investigation. It’s safer and less work to know the rules of the road and abide by them.

Now How Do You Know If Your Site Has Been Banned? If your site’s pages are highly ranked in one search engine, but missing in action from another, your site may have been banned, or at least highly penalized. When search engines detect your use of spam techniques, they may ban your site and completely remove its pages from the search index. On the other hand it can penalize your site by removing some pages from the index, or lowering your rankings from normal levels.

You should suspect a ban or penalty if your home page can be found only by a direct search on the URL -queries for words on the page don’t work anymore. Another way is that the number of your site’s pages included in the search index rapidly decreases. To check, do a search for site:www.yourdomain.com. If the search engine shows fewer and fewer links to your site each month. Search for link:www.yourdomain.com to find out what your links are and keep a watch on them. If your site’s search engine referrals have dropped drastically in a short period of time you may have been dropped by some engines. You can use your Web metrics software to detect this situation. If you suspect a problem, you need to diagnose the cause.