Things MUST not do for SEO!
When you are doing SEO for your own web site, you find lots of tricky around different blogs or forums. And here we summarize some of them and would like to suggest you to avoid, otherwise you would risk yourself from being banned from some major search engines and directories, like Yahoo! and Google.
Here are them:Double Identities - Cloaking
Cloaking is a general SEO technique in which it presents the content to users and search engines differently. This is done by delivery different content based on the IP adresses or the user agent in the HTTP header, for example, Google crawler presents as googlebot when it crawls your site.
So some webmasters create two versions of page, one is for the enduser and one is for the search engines. but some search engines, like Google, regards this kind of technique as dirty trick to cheat their search engine for high ranking. For this reason some search engines threaten to ban sites using cloaking.
Doorway Page & Spamindexing
Another technique to avoid is called "doorway page".
Doorway pages are web pages that are created for spamdexing, that is to spam the index of the search engine by sending the search engine with spamming keywords, but serving the endusers with different page. This technique is combined with the use of cloaking method we mentioned above.
Some webmasters use some basic technique like meta refresh, javascript, even some coding (PHP, Perl etc.) redirection to serve the doorway page before sending the real page. And the most used doorway page are those pages with high rank in the search results, so they want to cheat the search engine that their content are of high rank.
But some doorway pages are easily to be spotted out as the search engine regards the content as duplicated and removed from the index.
More on Spamindexing
Here are more technique on spamindexing, NEVER try to use it as they are already spotted out by most search engines, like Google, for filtering.
1. Hidden or invisible text - some webmasters generate some hidden text by using the background color with the text.
2. Keyword stuffing - repeating keywords in the content unnecessarily.
3. Meta tag stuffing - similar to keyword stuffing, just repeating the keywords in the meta tag and some keywords are unrelated to the content.
4. Doorway page - serving different pages to endusers and search engines.