wikiality

【訳語】定訳なし
【語義】大多数の合意によって定義されるリアリティのこと。特に Wikipedia などの共同作業により得られたものを指す（Wikipedia + reality）

Web 2.0 で語られる「集合知」というものの、非常に危うい一面を伝えている単語です。

オリジナルはこの辺りらしい（Word Spy より）。

Any user can change any entry and if enough other users agree with them, it becomes true. ... If only the entire body of human knowledge worked this way. And it can, thanks to tonight's 'Word': Wikiality. Now I'm no fan of reality, and I'm no fan of encyclopedias. I've said it before: Who is Britannica to tell me that George Washington had slaves? If I want to say he didn't, that's my right. And now, thanks to Wikipedia, it's also a fact. We should apply these principles to all information. All we need to do is convince a majority of people that some factoid is true.
—Stephen Colbert, "The Word," The Colbert Report, July 31, 2006