Wikipedia was made/started on January 15 2001 by Jimmy Wales and Larry Sanger.
Wikipedia is a website which is mostly made up of webpages.
Wikipedia was founded by Jimmy Wales and is written by hundreds of thousands of volunteers. There is a non-profit foundation that maintains the servers and pays the bills, but no company "made" Wikipedia.
On the computer.
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2001
Anyone can edit Wikipedia. The person that made the site controls whether or not you can edit.
2003, wikipedia
it was created in 2001
No statement by the founders of Wikipedia has been made as to their liking or otherwise if pie.
According to Wikipedia, Twitter was made on July 15, 2006
the first calender was made in 1908. i checked it on wikipedia