Technorati tracks what is happening on nearly 100 million blogs. Technorati is the recognized authority on what’s happening on the World Live Web, right now. The Live Web is the dynamic and always-updating portion of the Web.

Not in the Top 100 in 2013

Website Cost Availability
Technorati Free Online
2013 2012 2011 2010 2009 2008 2007
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Comments from some of those who selected Technorati as one of their Top Tools 

“the place where you can listen and find new information, voices, conversations in World Live Web (RSS feeds + blogs)”  Carmen Holotescu
“much of my learning occurs in forming connections with others – sometimes in related fields, other times in completely different disciplines. When I want to learn more about a subject, I turn to blog search engines and start forming a network on that subject. Time in a network translates to depth of understanding (engagement and reflection are important too).”  George Siemens