Technorati doesn't make it easy to find out much, except by trial and error (I specialize in the latter.) I finally went to "Help" and found FAQ -- which for the most part deal with tech questions, although it did include "What is Authority" as one.
I searched for tags using one from one of my blogs, and, sure enough, my blog popped up.
I don't feel the need to join Technorati to count hits or popularity or whatever it is counting.
This is obviously a useful site for searching the blogosphere, so could be a useful link in a library's website. Libraries with blogs could also use it to measure the hits (etc.) as noted above.
23 things #14