Anyone know what popular commenting systems are indexed by Google?
 

For example Discus and Facebook on page commenting...

Its a waste of good SE food if they are not going to be indexed.....

I image that none of these services would *want* to be unindexed... What's your thought with that? Is there evidence that Google doesn't index Disqus for example?

Other players in the space include

http://www.livefyre.com/
http://www.viafoura.com/
http://intensedebate.com/

I was thinking more about the way they are implemented on the page - For example JavaScript/Ajax and Iframes....

Disqus.......

why? do you want to spam them?

No.......