Google, a multinational multi-product corporation best known for its internet search engine, was incorporated as a private company, in September 1998. Although the founders are Larry Page and Sergey Brin, early in the history of the company leadership became a troika with the addition of Eric Schmidt. On June 27, 2011 -- the day before the company announced the creation of its Google+ social network -- Google's stock price closed at $482.80. With 322.25 million shares outstanding, that implied a market capitalization of above $155 billion. The immediate effect of the Google+ announcement was to add another $20 billion to that.