See:
http://blog.disqus.net/2009/08/25/disqus-v3/
"A few comments from a user who had been considering installing Disqus
on one of his blogs, until recently - and I think you'll find that I
speak for many who stay quiet because they don't want to be bothered
with the usual flamewars that arise when fanboys hear what they don't
want to hear ...
1. I notice that the link to my homepage has vanished from my Disqus
profile. Is this a change in Disqus policy, or just a temporary
malfunction? If we're looking at the former, and Disqus isn't going to
be providing commenters with the chance to get that homepage link,
then I would consider this to be a deal breaker.
As a commenter, I am not going to agree to link to a service that
isn't willing to link back to me, nor am I going to spend my time
writing comments for a blog configured to force me to use such a
service. As a blogger, I'm not going to ask my visitors to make use of
such a service, themselves. I appreciate the time and trouble that
goes into crafting a well thought out response, some of which (on some
blogs) have almost become posts in their own right, and see the link I
give back to somebody who has positively contributed to the content on
my blog as being the very least that I should even think of offering
in return.
2. I notice that the buttons have failed to work in some places in our
account managers, including, in an almost amusing way, the button on
the form for contacting support. Trying to report a problem, and
finding oneself stopped by yet another problem, is not an experience
that is going to build much confidence in the service.
So far, so bad. I think the staff is slowly destroying what was once
an excellent service offering intriguing possibilities, under what I
take to be the theory that any attempt to combat spam is, by
definition, good, whether it works or not, and whether or not the
collateral damage it causes could have been reasonably avoided. I
think we've all seen spammers continue to post urls where homepage
links have been absent; this isn't going to slow them down one bit.
But the honest site owner who wants to build up a web presence by
doing exactly what he's supposed to be doing - by posting content that
others want to see - stands to get really hurt by this nonsense, and I
see little evidence that Disqus cares about that problem at all."