By guest author Jawad Shuaib, the founder of Shuzak.com: The social network for geeks. Startups have been multiplying like rabbits over the past three years. Due to the added competition, many startups are beginning to narrow their focus to a much smaller demographic. The year 2007 will mark the transition from startups aiming for the mainstream markets to specialists intensely f in Web Culture > Web 2.0with businessnichestartupweb2.0webbusinessby 3 users