Running Comment-ary

After skimming through some comments accompanying some blogs, I discovered no new conclusions in regards to their comments feature.  Comments, in general, serve to compliment (praise), criticizes (suggest), attach related/unrelated information to, or any possible combinations of the three.  In my opinion, typical comments promote/support, detract from/flame, enhance, or answer questions raised in the content.  They tell a blogger that there's an audience out there that's interested in the subject or author.