From a wiki about Adele to one on Zoroastrianism, there seems no end to the well of editable online knowledge, writes Rhodri Marsden.
If someone challenged you to name a wiki, you'd probably start by pointing out that it's not much of a challenge. Then you'd shrug and say "Wikipedia". Almost absurdly prominent on the web, Wikipedia has taught us everything we think we need to know about wikis: pools of knowledge, contributed to and edited by their users, a push and pull of information that's constantly in flux.
Often they benefit from the wisdom of crowds; occasionally they suffer from the stupidity of individuals. But that process of negotiating what satirist Stephen Colbert once termed "wikiality" ("a reality we can agree on") has started to bring together huge communities of people dedicated to amassing knowledge bases.
Search the internet for a wiki about Adele and you'll find a standard Wikipedia entry, restricted to the typically dry, encyclopaedic content that's permitted by its fastidious administrators. Next on the list, however, you'll find adele.wikia.com, "The site about the British singer/songwriter Adele that anyone can edit." Contained within this wiki are hundreds of pages of information that may well be deemed too indulgent for Wikipedia, but certainly aren't for Adele fans. They pitch in with everything from analyses of the lyrical content of b-sides to spurious information about choreographers who worked on her videos; a team of like-minded people, dedicated to dealing exhaustively with the subject of Adele Adkins.
If you consider Adele to be limited in her factual scope, perhaps check out the terrifyingly comprehensive memory-alpha.org ("A collaborative project to create the most definitive reference for everything related to Star Trek") or the surreal creative splurge at uncyclopedia.com ("the content-free encyclopedia that anyone can edit"). The wiki is thriving and recent statistics from Wikia, home to many of them, provide us with a useful barometer. Co-founded eight years ago by Wikipedia's Jimmy Wales, and retaining a loose link to the Wikimedia Foundation, Wikia (stress on the second syllable) has seen huge traffic growth of late, with more than 250,000 communities established and 60 million global users a month. Divided nominally into gaming, entertainment and lifestyle sections, Wikia is now the fastest-growing entertainment site on the web, and earlier this year leapfrogged Rupert Murdoch's IGN to become one of the web's premier gaming resources.