> Why should comments not be immediately visible? People can already write mails to authors. That's not what builds momentum. The interesting part is the interaction of the audience.

I agree, but I was thinking of some filtering function wherein the webmaster can whitelist/blacklist comments. If a certain site or topic attracts - for whatever reason - visitors who abuse the comments, the webmaster needs to be able to block stuff afterwards or even upfront. An ideal life would be wherein every visitor/commenter does only nice things.

> Hardly anybody writes comments on old posts.

Interesting idea. I always like it when I get responses on my videos/comments on Youtube from years ago.