How can I know authority site?

I want to create link exchange with authority sites.
How can I know which one is authority site?
Are there tools.?

Many Thnaks

 

Technorati always shows the authority of each blog.

 

authority site means that trusted web site.

how you can be an authority site
* dont make spam
* dont cheat somethink from anybody
* find backlinks
etc


shortly, continue to work on your site

 

He wants to know how to find if a site is an authority...

Maxtan: Google the website, and if it has 5 links under it, it is an authority. For example, google "CNN" and you get:

World - www.cnn.com/WORLD/
US News - www.cnn.com/US/
Sports - www.cnn.com/si/?cnn=yes
Witness survives by pretending ... - www.cnn.com/.../index.html
More results from www.cnn.com »

Under the main result. That means CNN is an authority site in google's mind.

 

Ya, but how can you become an authority site? Lots of backlinks or?

 

Check if the site is at the top of google search results for the term you want authority for