Thinking about it, perhaps forum size / #of posts, active posters etc may be a better way to assess the size of a clubs fan base
That would iron out things like trophy history, position in league table, ground size, pricing policies, shit owners, attendances etc that are simply not comparable
It would be interesting to see of the main forums associated with each club how the user metrics compared
This looks to be SFC’s main site and it’s dwarfed by WACCOE which is in turn dwarfed by ones like Red Cafe