Greg writes "Wikipedia, the online encyclopedia that anyone can edit, first launched on January 15, 2001. Today, the website is thus 10 years old. To celebrate its 10th anniversary, Wikipedia is hosting some 400 conferences and parties across the globe. In traditional Wikipedia style, the events are being organized by its community of users. After a decade of growth, Wikipedia is an important source of information for millions of topics and remains among the Internet's top 10 most visited sites. It has over 400 million readers each month and has a very small budget for a website its size: just $20 million. Almost all its revenue comes from donations. In its last fundraising push, the organization saw 500,000 users donate $16 million."