Today, the struggling company is undertaking a major turnaround effort led by former Googler Marissa Mayer. It is unclear exactly how Yahoo! intends to pull itself from the brink of obscurity, but one thing is crystal clear – the old Yahoo! is gone and it's never coming back. Google Inc (NASDAQ: GOOG ) Google – also known as the harbinger of Yahoo!'s demise – ushered in the search era. Did you know that from November 12 to December 12 of 2012, Google recorded a market share of 66.7% of the US search market? With the billions of dollars generated from search-based advertising, Google has invested in, created, and purchased countless products, projects, companies, and ideas. Notably, the company recently achieved success with its Android mobile operating system, purchased Motorola for $12.5 billion in May of 2012, and maintains a portfolio of some of the world's most popular consumer web applications, such as Gmail, Maps, YouTube, and News. But even Google doesn't get it right every time.