Idea Discovery and Review Website Launches Invites

I'm spending a fair amount of time these days working on social networks—Facebook (don't get it), Linked In, Ning, and Twitter. My main idea is to see how and if they can be used not to market Toastmasters but to improve "circulation" of Toastmasters information and to increase member awareness and participation. This site preview popped up on Twitter overnight and sounds kind of intriguing. Reminds me in some ways of another site I've been looking at, Big Think.