coRank allows you to build your own Digg like site with public sharing, voting and commenting. Anyone can create their own site for free and with very simple steps. Such a service can be applied to any generic purpose that requires voting and user collaboration but coRank is somewhat narrow in its focus and restrictive. It has modeled everything about it to be a Digg clone, to share web link items and vote on it, rather than looking at the purpose such a tool would serve. The labels, interfaces and backend are sharing links.
It is free and it does its job very well, I only wish they had taken a step back and had made this more generic. The Digg-clones should be just another "templates" one can create with coRank, not the only ones.
I have created a new site, Books On Bart, to implement the Social networking around commuter readers idea. It isn't the perfect fit but serves the purpose well.
I think coRank offers big opportunities. When they open up complete customization and API, this tool will become the meta-tool that can be applies for innumerable purposes.
They seem to make money from the Google Ads they display, but I wonder if a subscription model for those who want API and other features might be a better business model
