We have observed various cases where websites which were not being optimized in any way moved out of Google index. So we know 100% that it was not a case of paid links, back links, or free links. However, with careful analysis of one of our client website we observed that some competitor created a duplicate website and VOILA search engine ( The Mighty Google) threw the client's original website in Supplement index. The duplicate version of the website started to show on search results and the original one was out of Google index. I assured the client that your penalty has little to do with paid links. We immediately asked the client to change their content on the homepage and then it was Bingo ! The site jumped back within 15 days flat. We have seen various factors which are completely unrelated to SEO and can seriously affect your website. In case your website is out of Google index, follow these simple guideline:- a) Check if someone has copied your content or you have copied content from somewhere. There are cases where your content writer might copy content from some website without your knowledge. Some people argue that supplement index is not penalty, but I can assure you supplement index means out of Google Index. b) Check if you have overstuffed your pages with your target keywords. c) Remove Meta Keywords from your main pages if you have overstuffed meta keywords tag. d) Ensure that you have keyword density of around 2-3% for 250-500 words page. e) Remove excessive H1, H2 tags from your website. f) Check if you have added duplicate listing in Google Local Business or Google Places. We also observed one of our client website being moved out of Google Index because someone from their office submitted a duplicate Google Places listing using a new number. The moment we removed the duplicate listing from Google Places, the site jumped back to previous position within 15 minutes [It was faster than Bullet Train]. I was wondering either God must be crazy or Google must be crazy to add these sort of rules in their algorithm. We have personally observed that Google does not necessarily give you penalty for back links. There are several vulnerable areas in Google and if you happen to be close to any of these areas, your website will move out of Google index. Analyze each and every aspect of your website. If most of the websites move out of Google index for purchasing links then any competitor can get another competitor penalized on Google. This is not always the case, so if you find your website moved out of Google index, simply analyze each and every aspect of your website whether it is content, keyword density, affiliate links, or even Google Places Listing. Best of Luck with your website's Optimization
Much of this is urban legend. No penalty for this, it just doesn't help. No penalty for this, it just doesn't help. The search engines have never looked at keyword density as a ranking factor. It plays no role whatsoever, whether negative or positive. No penalty for this, it just doesn't help. The point about duplicate/scaped content has considerable merit. Another common reason for being banned from the index is some form of cloaking. You may well be right about Google local listings too (I never verified that myself, but I can believe it).
The article was good but i am not agree with some parts: e) Remove excessive H1, H2 tags from your website. Really its not needed that you remove them. f) Check if you have added duplicate listing in Google Local Business or Google Places It will not hurt your website and will not cause that your website to be removed from Google index