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Flickr
Founded: 2004Estimated users: 4 million
Addictiveness rating: 9.5
Considered one of the first true web 2.0 sites on the net Flickr combines a photo sharing service with a blog. It's online community tools such as the facility to tag photographs and allowing them to be browsed has helped boost its popularity. It is estimated that nearly 1 billion photographs have been stored on the site.
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