What is the Quora?

For several months is between us network has been attracting the interest of many people, myself among them, the call Quran network. You may wonder: that is the Quora ? Quora is a network has been created by 2 engineers working on Facebook, so you can imagine what level of quality has. But Quora not a copy of Facebook, is rather a rare combination of Google, Facebook, Wikipedia and Yahoo Answers