Quora is NOT the next great search engine. Although at first glance you might think that is exactly what it is. No, instead, Quora is an attempt to fill in all the spaces left untouched by Wikipedia. Founded by former Facebook engineers Adam D’Angelo and Charlie Cheever, Quora seeks to tie a question-and-answer format to the social framework of the Web.
Joining Quora is as easy as logging in to Facebook or Twitter. In fact, signing in to Quora immediately links these accounts together with your Quora account.