A Facebook Fan Page is a business account that represents a company or organization. It looks similar to a Facebook Profile, but it offers unique tools for managing and tracking engagement.
Doorway pages are simple HTML pages that are customized to a few particular keywords or phrases, and they are programmed to be visible only by specific search engines and their spiders.
Google Trends is an online search tool that allows the user to see how often specific keywords, subjects and phrases have been queried over a specific period of time.