I have recently been working on achieving a high PR for my website to help with search engine optimization. I asked some of my friends for suggestions and they told me to use site maps. But they also warned me that putting a sitemap will not let me have an increase in PR immediately for it will take some time. According to the SEO process, you need to direct the spider correctly in order for your website to get more crawlers. A robot will be given a point of reference with links to make sure that the web pages are easily getting crawled in faster. What is your opinion on this?