Yahoo Answers in one of the world's fastest-growing sites – and can now boast that it's answered a staggering 1-billion questions.

Anyone with a Yahoo account can submit questions to the site and a team of volunteers does their best to come up with the answer.
And, on 15 April, the 1-billionth question was submitted and answered.
Yahoo Answers boasts 198,5-million unique monthly visitors, which grew by 11% last year.