Has there been any talks of incorporating more then just twitter nodes, maybe facebook/ instagram nodes for additional ad diversity?
Indeed there will be more than Twitter in the near future, Viral will continue to add new features as it grows naturally. Facebook will not be a part of Viral however many large social network platforms are lined up on the schedule to be implemented in the near future.
Facebook will not be a part because developer is banned for life there. It would break the court ruling.
The unique messages idea its good to not be classified as a spam.