Quora - a Question and Answer Website

I wanted to introduce you to Quora which is a question-and-answer website created, edited and organized by its community of users. Quora continually improves a collection of questions and answers and the most important thing is to have each question page become the best possible resource for someone who wants to know about the question.

Quora also combines Q&As with social networking, so you can search for people and follow them to see what topics they're interested in. When somebody answers a question, you can 'vote up' their answer, just like you would on Digg, and you can endorse users in much the same way as you can hit 'Like' on Facebook or say something nice about a colleague on LinkedIn.

Do you think Quora has possibilities or is this niche already saturated with Yahoo Answers, Google, Facebook Questions, Wolfram Alpha, etc.?