The most popular website of game is rather vague. For flash gaming, both Armor Games and Kongregate are very popular. For reviews, the Escapist's Zero Punctuation and PC Gamer website are respected reviewers. As far as PC/console gaming is concerned, most have their own wiki sub-sites and their official websites. It depends entirely on what games and what material you're looking for.
Other games website:
miniclip.com
freezinggame.com
addictinggames.com
Davyit.com (new)
According to Alexa.com, the world's most visited website is Google.com.
the answer is facebook.com
google.com
google.co.uk
google.com
WikiPedia
www.bundesregierung.de
Actually Google still is the most visited website in the world. However it has been competing with Facebook lately.
www.freewebs.com/thousand123456789
Facebook or youtube