During the Night Phase, players can vote to sub one player out like this:
Sub: Master Mew
Players can also vote "No-Sub"
The player with the most sub votes at the end of the Night Phase will be subbed out, unless there are more "No-Sub" votes. Again, this means players can be subbed out for not contributing even if they're posting fluff-posts all the time, and as an added benefit there will be discussion surrounding the decision meaning that the subbed player will see exactly why the other players felt they weren't contributing so they can improve in the future.