The estimated market value of Wikipedia is $11 or $12 billion. The replacement cost of Wikipedia is an estimated $6.6 billion. And yet those figures are pure speculation, because thousands of volunteers manage the website which is operated by the non-profit Wikimedia Foundation. There is no debate about Wikipedia’s significance. What is not speculation is that Wikipedia is the #1 online reference website with 15 billion pageviews per month. In search engine results, it ranks