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(PhysOrg.com) -- The stock price of a company continuously changes, going up or down depending on the collective activity of a large number of investors.

As Friendster , MySpace and many other social-networking sites have discovered, a successful business finds a niche that draws in a large number of users and offers intriguing, easy-to-use services that keep those users interested. Whereas Facebook , LinkedIn and Twitter have excelled at this formula, Google's efforts in this area-- Buzz (2010), Wave (2009) and Orkut (2004)--have faltered. The search-engine giant hopes its search is over with this week's introduction of the new Google+ ( Google Plus ) network