User blog comment:Brandon Rhea/Wiki domains will be changing from wikia.com to fandom.com in early 2019/@comment-25646820-20180823050640/@comment-25646820-20180823154356

Yes, you can be a fan of anything, Brandon, but that's not what Fandom is. Fandom is a subculture of like-minded individuals, not just "People Who Like Strawberry Ice Cream" or whatever.

In fact, my bias is the reverse of the one you suggest: popularity is not the criteria at all, it is the strength of the culture grown up around it.

I think you need to read some history: http://fancyclopedia.org/fandom

"Science fiction led to fandom's creation and continues to be its major focus, yet a liking for the genre does not of itself make you part of fandom. You cannot be a fan alone or even among others who also like sf — you must have contact with the microcosm."

This is the point Wikia is failing to understand about Fandom.