1. Craigslist
Founded by Craig Newmark in 1995, Craigslist has grown from a local ad site to a worldwide classifieds service.
2. Flickr
Flickr, founded in 2004, provided the means for photographers of any skill level to upload and share their images with anyone, anywhere. Flickr was one of the first true examples of Web 2.0 technology, offering both a useful service and a community of users that made the site what it is today.
3. delicious
delicious, created in 2003, was one of the world's first social bookmarking sites. Users find sites and then "bookmark" them via tags. There are over 150 million URL's bookmarked on delicious, and at least five million users who add more every day.
4. Google
Google got a humble start in 1996 and grew by gigantic leaps and bounds, expanding into Maps, Email, Images, Books, and even Web browsers.
5. YouTube
YouTube, the most popular video site in the world today, made it possible for users to upload and share videos quickly and easily: the first site of its kind to do that on the Web.
6. Amazon
Amazon.com, founded in 1994 as a simple online bookstore, is the largest shopping site on the Web today. Amazon changed the way we shop online, making it possible for people all over the world to purchase anything, anywhere, at any time.
7. Wikipedia
Wikipedia is the world's largest online encyclopedia of knowledge. Wikipedia can be edited or added to by anyone, and has grown at an exponential rate since its beginning in 2001. There are dozens of language-specific versions of Wikipedia, making it even more accessible to the global Internet population.
8. Pandora
Pandora, started in 2000 and run by the Music Genome Project, changed how Web searchers listen to music on the Web. Pandora made it possible to actually create and customize personalized radio stations, exquisitely tailored to specific tastes.
9.Facebook
Facebook, founded in 2003, is how more than 350 million people connect with each other online. It is the most popular social networking site on the Web.
10. USA.gov
There are literally millions of pieces of content available from governmental agencies on the Web, and USA.gov, the official search engine of the U.S. government, makes them all accessible to everyone. Tax forms, social security information, even links to the Library of Congress or the Smithsonian - you can find all this and much, much more.
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