Google Inc is all set to go on a hiring spree this year with the company planning to add over 6000 people around the world in one of the "biggest" workforce expansions in the history of the company. Senior Vice President of Engineering and Research Mr Alan Eustace said Google was "looking for top talent--across the board and around the globe." The company had added more than 4,500 workers in 2010 primarily in engineering and sales departments. The workforce expansion set for 2011 and said to the the "biggest hiring year in company history", will be more than the 6,100 workers Google had hired in 2007. Google plans to hire more than 1,000 workers in Europe alone this year. Google said it will recruit "as many smart, creative people as we can to tackle some of the toughest challenges in computer science: like building a web-based operating system from scratch, instantly searching an index of more than 100 million gigabytes and even developing cars that...