I am in USA and do not know to what extent things are blocked in Iran. IRC channels may or may not be. A new alternative is available at: Tinychat - Free Chat Room audio video conference Web based - easy to use. You set up a room and email or IM the room to others. It is not publicly available. Not that the govt might block all of tinychat, but if you accessed using certain methods, they would not know that you are there.