Technorati
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Technorati
Technorati is the recognized authority on what's going on in the world of weblogs. They help people search for, surface, and organize bloggers and their daily posts
Technorati tracks the number of links to, and therefore the relevance of blogs, blogs (vlogs), podcasts, and amateur movies and videos; all in real-time.
Founder David Sifry was previously cofounder and CTO of Sputnik, a Wi-Fi gateway company, and Linuxcare.