Questions about Search Engine Optimization are generally off-topic here. You may be able to find the answer to your question at Webmasters - http://webmasters.stackexchang.com
Search engine optimization - the process of improving the visibility of a website or a web page in search engines via the "natural" or un-paid ("organic" or "algorithmic") search results.
This topic is generally not a good fit for Web Applications. Questions regarding SEO are more likely better served by being asked at Webmasters.