Art criticism and the web

Yesterday Jonathan Jones, art critic for The Guardian, wrote this essay and call for suggestions about how social media have changed the way he thinks about art criticism and, to a degree, art.

As a rule, I never read the comments from readers at the end of newspaper articles or even blog posts. What am I missing? Is the really good debate and multiple viewpoints worth sifting through the inane repetition and side arguments? Are there any websites that have better comments than others? Let me know.