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Get information about any web site, like how popular it is
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Alexa web site information
Collection of information about a web site, including statistics on web site traffic, usage, popularity, related sites, contact information, mailing address and more -
Quantcast
Internet ratings service with visitor profiles for millions of websites and services. -
Quarkbase
Complete information about a website from over 30 data sources from the Internet, including social popularity, traffic, associated people, similar and related sites, domain ownership and registration dates, etc... Popularity factors include Delicious bookmarks, digg, Reddit, StumbleUpon, Google Groups, Yahoo Answers! and Technorari blog reactions and wikipedia links