The encyclopaedic institution has succumbed to the Web 2.0 tidal wave, & will start allowing Wiki entries and edits; just like its online counterpart's been doing for a while now. At least it sounds like they may have an editing team in place:

"Save any trivia about SpongeBob SquarePants for Wikipedia. But if you want to contribute, by name, to the history of Queen Elizabeth I, Britannica is interested."