#3 YouTube.com - 721.9 Million Unique Visitors

YouTube.com is the platform for uploading, sharing, and watching user-created videos. It was created by three former PayPal employees in February 2005. In November 2006, YouTube was bought by Google for US$1.65 billion, and now operates as a subsidiary of Google, and the site got more popular.

#2 Google.com - 782.8 Million Unique Visitors

Google.com is web search engine, popularly known as ‘search giant’. Google entered a crowded search engine market in the late 1990s, but won because it was the fastest and had a clean design. It was founded by Larry Page and Sergey Brin while both attended Stanford University.

#1 Facebook.com - 836.7 Million Unique Visitors

Facebook.com is the largest social networking site with over a billion registered users. Facebook was founded by Mark Zuckerberg with his college roommates and fellow Harvard University students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.

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