The term Troll has a unique definition in this CR section of YWN. Usually it is used to refer to someone ruining a site by posting fake, repetetive, or disturbing material. On this site it came to mean anyone with a different taste than your own.
This is not a help-me site, nor a recipe site. This section is for conversations about any topic, including funny ones. If someone starts a ridiculous topic, it is called being funny, whether you like the joke or not. If someone starts a conversation about what to do with his millions he is having fun; it is theorhetical or perhaps funny. If someone were to post an emergency Tehillim notification that turns out to be fake that would be a real troll. Also, if someone creates a fake impression of being popular through fake agreements, we can call that ruining the experience of users of the site, hence a troll. There are levels in between in which you’ll have to consult your LOM.