"Quora, the innovative site begun by former Facebook staffers, sees its popularity to explode - and it looks set to get bigger", the Guardian noted.

Quora is a simple question-and-answer site, which uses Twitter-style following to track the best answers to any questions. Information is organised more like Wikipedia than Google, with answer prioritised by how useful they are. You have to sign in and like Twitter you can choose to "follow" any question.
It is an ever-growing database of knowledge.

"Quora is a continually improving collection of questions and answers created, edited, and organized by everyone who uses it. The most important thing is to have each question page become the best possible resource for someone who wants to know about the question," the site says.

Quora was founded in 2009 by Charlie Cheveer and Adam D'Angelo, former Facebook staffers, and now has a large number of registered users even if the exactly number is still one of the questions you can find in the website.

What distinguishes it from other Q&A sites, such as Yahoo Answers (which is still, in the comScore firm measurement, the market-leading Q&A site) is that people use their real name. Everything is written tied back to a person.

"Why is it suddenly so popular?" - the Guardian wonders - "Because people have noticed that it has a strong preponderance of Silicon Valley's finest among its users, and that influential people are also using it: Steve Case, the co-founder and former chief executive of AOL, is among those asking and answering questions on the site. "

"The most interesting thing about Quora so far has been the extent to which people - even those in senior positions in public companies - are willing to share detailed information", says Milo Yiannopoulos in the Telegraph.

Moreover, he says, its usefulness is obvious and immediately accessible. "Twitter was fun for the few, but Quora will be useful to the many", he argues and it will be even bigger than Twitter.

The main problem, underlined by both the Guardian and the Telegraph, will be how to keeping the spammers out and maintain the answer useful and of the same quality, while broadening the users number.

Sources: Guardian, Quora, Telegraph