#1 Google
Enables users to search the Web, Usenet, and images. Features include PageRank, caching and translation of results, and an option to find similar pages. The company's focus is developing search technology.

There are tens of millions of sites to visit on the internet.
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#2 Facebook
A social utility that connects people, to keep up with friends, upload photos, share links and videos.

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#3 Youtube
YouTube is a way to get your videos to the people who matter to you. Upload, tag and share your videos worldwide!

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#4 Amazon.com
Amazon.com seeks to be Earth's most customer-centric company, where customers can find and discover anything they might want to buy online, and endeavors to offer its customers the lowest possible prices. Site has numerous personalization features and services including one-click buying, extensive customer and editorial product reviews, gift registries, gift certificates, wish lists, restaurant and movie listings, travel, and photo processing.

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#5 Wikipedia
An online collaborative encyclopedia.
