You just need to evaluate the algorithms of search engines. What we are now and will certainly be my idea and the wrong, but it is at least as it is based, rather than the mythical 5-7%, which is correct, the facts no one can confirm. My opinion is based on the following principles: – except for employees of Yandex and Google no one knows what 'necessary' density, so that does not make sense for several years on the forums to ask a question to which no one right answer is not – PS have always been for naturalness and natural – PC today are much smarter than a few years ago, they probably understand that a combination of words, repeated several times in each paragraph – it's black techniques optimizers. Concluding, we can say that I am when I write an article, do not pay attention to the density of keywords is not. My opinion – this is an outdated method of promotion, which brings benefits as much as a social run. Bookmarks, that is, zero.
Therefore, publish articles, as if PS does not exist naturally and natural. PS algorithms are constantly being improved to ensure that sites are seen through the eyes of ordinary users. Publish these texts that will be informative in the first place people, and be assured that you will automatically favor poluchete PS. Finally, I want to give some advice on how well all the same to write articles – write a title keyword, let the visitor to immediately understand what will be discussed – the first paragraph should be without poetry, informative, so it was immediately clear whether or not to read the article – Highlight important points in bold, not keywords, namely, the important points – if a word often repeated, gave him a synonym. In fact, it's everything. Sticking to these simple recommendations will make the text readable and useful, especially for men. I recommend not to fool their brains expecting some interest, but just think about the readability of the text and you will thank the search engines.