In the effort to live up to its promise and to combat the general lack of adequate filter in search engine results, Bing has selected content from only nine trusted medical sources for queries having to do with health.
Although that number seems incredibly limited, it’s easy to see why Bing has gone this route. There are literally millions of websites devoted to answering questions and offering advice related to medical conditions. A Google result for the generic phrase ‘back pain’ yields 143 million results. It isn’t easy for user to distinguish between rubbish and sound medical advice, particularly if they aren’t working in some sort of medical field.
Does Bing Auto-Suggest and Google Instant Search affect SEO?(Search Engine Optimization) Yes they do; they each limit a user’s options, narrowing your chances at gaining a visitor.
The question here is do online reviews affect your SEO rankings? The answer is a resounding yes.
While most online business owners know the importance of optimizing their website, few if any, are experts in the field of 
SEO is a complicated process, for a lot of different reasons. One of the biggest ones is the fact that search engine algorithms are a closely guarded trade secret; as secretive as they are, though, it’s well known that Google uses well over 100 different factors to determine page rank. Their goal is to make it difficult for webmasters and designers to come up with page ranks that their sites don’t deserve. On top of that, the environment changes constantly; what was working in ’04 didn’t work in ’05, and what worked in ’08 doesn’t work in ’10. Here’s a roundup of some bad and/or outdated practices for 
Improving keyword density on a website is an important consideration when creating website content as well as adding new content (articles, blog posts, etc) towards increasing search engine results. It is important that you understand why keyword density is important, and what it means to your website. Keywords are words that regular internet users use in order to search for information on the internet. Searchers punch these keywords or keyword phrases into the search engine, looking for specific results.