Sitemap files contain a list of page URLs that you want indexed and are read by search bots. Social tools form a vast (and anarchistic) town square where anyone can post and instantly (yes, within a second or two) reach a billion people. Avoid adding unnecessary extensions at the end of URLs. Today, there aren’t a lot of free methods left to get organic traffic. Plus, for those that do exist, they often require an incredible amount of technical knowledge. Once SEO gets into full swing I have seen cases where the upsurge in leads has been more than the client could handle.