The insistence on not letting anyone browse without associating your Twitter or FB account is what killed it for me. I used FB Connect when it first launched and after disconnecting the site I was spammed pretty regularly with emails about various conversations, but I couldn't remove myself from the mailing list without re-connecting thru FB which I didn't want to do (mostly out of principle), instead Convore emails all get flagged as junk. I don't see them anymore.
I'd also guess that they probably don't get any search engine love if the site and conversations can't be indexed. I don't think Googlebot has a FB account :)
Their compete graph is pretty abysmal, granted the real time infrastructure would skew page view counts way down but people still need to navigate to the actual site and you'd think a high profile startup would have more than 2800 unique visitors in a month.
