Any SEO company which uses doorway pages, hidden text, link farms, or automated submissions should be avoided at all costs. While many of these techniques may give your site high rankings temporarily, eventually the search engines will discover what you are doing, and they will permanently remove your site from their listings. The last thing you want to do is pay an SEO companies hundreds to thousands of dollars to optimize your site, only to have it banned because they used bad seo techniques.

When webmasters use doorway pages, they stuff a large number of keywords and links onto the page. Doorway pages are usually connected to cloaking, and the visitors will never see these pages. Link farms are easy to detect. They tend to be a page full of links with no content. If you've ever been to a website which has nothing but links, this is an example of a link farm. Hidden text involves making the text on your page the same color as the background, so visitors can't see it. Automated submissions allow companies to spam search engines or other services with thousands of submissions. Using any of these techniques will get your site banned.