User blog comment:Trellar/Introducing Wikia's New Homepage and Logo/@comment-4407814-20120406065911/@comment-3508190-20120406191255

True about the browsers. That's kind of the idea. Through the caching you would get to keep "your" icon for a while - a few days - a week. Other users would see different icons all the while. The entire set would be evenly distributed among the visitors. It would be impossible to predict who would see which.

And they're similar - easily identifiable as created by the same designer - but they're not identical. You can argue that similar is not enough to create a corporate identity. But then again: Wikia is a bit of a different site. Wikia is a site that is supported but not made by corporate. Wikia is medium not message. Wikia corporate has to be a little careful not create too much corporate identity or too much message itself. So why not have a family of favicons that represent a certain looseness and laissez faire and delegated identity?