#6 Facebook

Facebook is the largest social networking service in the world with more than a billion users. Mark Zuckerberg cofounder and CEO of the company has steered the company to its successful first IPO.

He founded the company with roommates and fellow Harvard University students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.

#5 IBM

International Business Machines Corporation or IBM, is an American multinational technology and consulting corporation. IBM manufactures and markets computer hardware and software, and offers infrastructure, hosting and consulting services in areas ranging from mainframe computers to nanotechnology.

IBM has 12 research laboratories worldwide and, as of 2013, has held the record for most patents generated by a company for 20 consecutive years. Its employees have garnered five Nobel Prizes, six Turing Awards, ten National Medals of Technology, and five National Medals of Science. Notable inventions by IBM include the automated teller machine (ATM), the floppy disk, the hard disk drive, the magnetic stripe card, the relational database, the Universal Product Code (UPC), the financial swap, SABRE airline reservation system, DRAM, and Watson artificial intelligence.

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