Having played Mafia several times now, I'll just point out its almost always bad to abstain on the first day. Sure, we don't know anything yet, but by abstaining, we learn absolutely nothing, and stay in the same state as the previous day, except we'd be down a good guy. Even if we end up mislynching, we can use vote patterns to discern who is Mafia. So I'm not abstaining.
Having said this, I'll vote in a bit when more people have said things.