Yahoo! Inc. (NASDAQ: YHOO) is a United States public corporation with headquarters in Sunnyvale, California, (in Silicon Valley), and provides Internet services worldwide. The company is perhaps best known for its web portal, search engine, Yahoo! Directory, Yahoo! Mail, news, and social media websites and services. Yahoo! was founded by Jerry Yang and David Filo in January 1994 and was incorporated on March 1, 1995....