Before you decide to purchase links to build your Link Popularity you should read this article.
Definition:
Google banning occurs when Google removes your site from its index and flags your domain as 'banned', so it won't spider your site anymore. It is actually a serious disease and may be even life threatening specially for small websites.
Etiology:
Webmasters' mistakes are almost always the leading causes of google banning; here are some of the common mistakes that will get your website banned:
1. Using small or hidden text in your web pages. Some webmasters will try to use hidden text containing certain keywords inside their site, so that the text is not visible by the human eyes, but visible by search engines.
2. Using popular keywords such as "sex, mp3, yahoo" in the meta tags when the subject of your site has nothing to do with those keywords is commonly called keyword stuffing.
3. Participating in Link farms. Link farms or Free-for-all links pages are pages that consist of links and exist solely to help listed sites gain higher search engine rankings. These pages have no unique content just links. Obviously you can't control which sites link back to you, but if you link to link farms, your site will get banned.
4. Submitting multiple versions of the exact same page or an identical page for indexing. Some webmasters try to increase their page count by having similar pages and only changing the title, subject or small word changes.
5. Using unauthorized automated software to submit pages, check rankings, etc. Such programs violate Google's terms of service. Google does not recommend the use of products that send automatic or programmatic queries to Google. It is better to hand submit your site and only do so once a month.
6. Keyword stuffing: adding too many keywords in Meta tags or page text is called Spam and will get you banned. For example, if your website contains 400 words and the keyword phrase "website advertising" is repeated 50 times, the search engines will most likely think you are spamming them.
7. Using Doorway pages: Doorway pages are Web pages designed and built specifically to draw search engine visitors to your website. They are standalone pages designed only to act as doorways to your site. Doorway pages are a very bad idea for several reasons, though many SEO firms use them routinely.
8. Linking to a banned site, specially extensive linking as in networks.
9. Registering an already banned domain. Some webmasters, after their website becomes banned from google due to any reason, delete this domain and register another while the first domain remains banned from google. So, before you register a domain, make sure it is not banned by doing the test mentioned below in "Diagnosis".
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