meint TechCrunch, daßwhich is calculated solely on unique inbound links to the blog itself
Bloglines is taking a different approach, by factoring in a number of statistics such as Bloglines subscribers, link analysis and other information. This may eliminate or reduce the non-topic-specific Technorati authority problem. Sphere is making an effort to assign real authority to a blog on a given topic. They look at links in and out, as well as a semantic analysis of the blog itself. Theoretically, on Sphere a blog that is relevant in one area won’t be relevant in another.