Thanks everyone for your views. I started this discussion, as I am currently doing a test on OutBrian. We are primarily a publisher, looking to gain more traffic.
Moosa, I believe the conversion cycle anyways varies on the product, however in my experience with quality content to support a conversion, this time to convert drastically reduces.
In my observation commenting tools like Disqus which provides a network of site that not only helps you to reach larger audience but also helps users navigate to most commented articles on your site itself.. This is one of the reason I am trying out these content discovery platforms.