Technorati

Technorati was one of the very first blog search engines around. Its aim was to assist bloggers' success through constant collection and distribution of their unique content into a "global online conversation". Over the years they have expanded to contain a general web directory and are also a full service media company with a wide variety of services targeting both blogs and social networking sites with the goal of connecting them with relevant online advertisers.

More information about them, from the website:

The leading blog search engine and directory, Technorati.com indexes more than a million blogs. The site has become the definitive source for the top stories, opinions, photos and videos emerging across news, entertainment, technology, lifestyle, sports, politics and business. Technorati.com tracks not only the authority and influence of blogs, but also the most comprehensive and current index of who and what is most popular in the Blogosphere.

In July 2010, comScore ranked Technorati Media as the 4th largest social media property and the 3rd largest blog property.

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