A comments system kinda goes against what we currently think the
direction of 6d should be. The theory is "one person, one site" and
you communicate with each other's site through your own. As we're now
building multi-member support the same still holds true. While each
member is a part of one domain they will still essentially have their
own instance of a 6d site with their own separate addressbooks and
"friends". We did this because having to register at every site you
go to is annoying and silly, there's only one you, so there should be
a way to control that through your site. One of the next steps we
have is probably going to be building in a single-user OpenID server
into the framework also. Again your identity should be completely
under your control.
Now obviously some will want comments on their site and I think that's
best left to a Disqus plugin or maybe twitter. Yeah it sucks having
to rely on a third party, but I think so does registering at sites and
relying on them to host your thoughts.