#5 Wikipedia.org - 469.6 Million Unique Visitors

Wikipedia.org is simply the easy and best source of knowledge. It is a collaboratively edited, multilingual, free Internet encyclopedia supported by the non-profit Wikimedia Foundation. Its 24 million articles, over 4.1 million in the English Wikipedia, are written collaboratively by volunteers around the world.

As of February 2013, there are editions of Wikipedia in 285 languages. It has become the largest and most popular general reference work on the Internet, having an estimated 365 million readers worldwide.

#4 Yahoo.com - 469.9 Million Unique Visitors

Yahoo.com is a search engine and platform that connects to users to other Yahoo properties, such as Yahoo Finance and Flickr. Yahoo is one of the original Web portals from the 1990s; it offers news, sports, finance, and email.

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