So... I'm in a group for brazilian users. Naturally, everyone there speaks portuguese. And since the group boards are private, can we post and create boards written in portuguese there?

What do you mean with boards? Threads in the forums? If so:

I would speak english overall the site before you recieve a warning (I know what I mean, got one since I spoke once german here on subeta)

Not boards, but threads created on forum groups (quite recent feature). Since the group threads are private only for the group and our group contains only portuguese speakers, I think that's allowed.

That's quite tricky, since it's a feature of the forums and the forums are restricted to english - better wait for an answer of the mods :)!

yup yup, I'll wait. Private areas, such as sMail, speaking other languages is allowed. But since it's still the boards, I'm not sure. Rules should be updated as new features are released. Thanks (:

I would encorage waiting for an official reply, but since the forum groups are being touted as a replacement for Cults, I would guess that the rules for Cults are in effect.

You can also file a ticket, it might be faster than hoping a mod sees this.

Thanks, gonna fill a ticket. I was trying not to do it, but there's no other (fast) way xD