It really depends how you yourself define it. It can be fans
fitted inside a bus or it can be a person who is passionate about
the model of buses. It also can be a person who knows all the bus
routes of singapore. It also can be a person who know the latest
updates about buses and thus earning the rank of bus fan by
others.
It really depends how one define it. Anyway, thanks for making the
activity in bus forum so bustling. It somehow reminds me of Bedok
and Boon Lay interchanges. Lol. 
However, please do note that all of us hope that the replies here
are constructive instead of craps or crabs whatever you call it.
Eating too many crabs and seafood is certainly not good for health.
All of us will want to know more information pertaining to new
buses, bus routes, latest updates about buses. These info can be
educational to the public. And please do not label us or this forum
as wierdo forum cos it reflects on yourself.