Quora is the most evocative learning tool I’ve come upon this year, 2010. I look at it like Facebook for knowledge.
It has the content relevance to me, that makes FB great. While expressing useful, encyclopedic information, instead of personal, emotional updates.
It’s fucking fast and UI-responsive.
The fact that I can subscribe to any topic that grabs my curiosity by the balls, makes it incredibly addictive. I’m literally checking for Quora updates like I do on Facebook.