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I got an idea to social facebook application. anyone can give me a tips or tools or a book where i can get this answeres?: how to Find out if this niche has enough people that interested in this subject who Best Target Audience what Best Profit method (pay per month membership, AdSense, leads, etc...) What is the best market for this idea (country, languages, ages, gender, etc) where to Find who are the Competitors & Similar services / application and how to beat them a list of affiliate market for the related site niche? well. i dont even expect someone can answer me that quesitons in this post but give me please links, clues , book, lessons or company that do that