Wikipedia

Wikipedia co-founder Jimmy Wales with Grover at the 2010 Shorty Awards.

Wikipedia is an online encyclopedia written in collaboration by contributors on an editing platform powered by wiki software. Founded in 2001 by Jimmy Wales and Larry Sanger, the wiki format allows anyone to create and edit entries verified by published and other external sources. This system benefits from its breadth of coverage and has been noted as a facilitator for the democratization of knowledge and a reduction in commercial bias.

“Imagine a world in which every single person on the planet is given free access to the sum of all human knowledge. That's what we're doing.”
—Jimmy Wales

Co-founder Jimmy Wales also co-founded WikiCities, the topic-focused wiki company later known as Wikia and Fandom Inc., host of Muppet Wiki.

References

• The third season Sesame Street Podcast with Foley & Friends episode "Libraries" features a scene with Oscar the Grouch at a library where he's using a computer to look up information on Ickypedia. He describes it as an online encyclopedia about everything icky. One fact he shares is that there are more than 900 kinds of slime mold in the world.

• A Wikipedia article on Dr. Teeth and the Electric Mayhem is the first result on Nora's web search on the band in The Muppets Mayhem episode "Can You Picture That."