What they said. Also add the President and their listed Cabinet to the government feed. I like the idea of a Speaker election in-game. The speaker could have the same role in the feed as Party Presidents and MU Commanders.
The Speaker can also make the feed visible or hidden to the public. Citizens then have view rights. The posts while hidden remain so even if the feed is turned visible later.
Extending it, you could give the Speaker moderation powers. Allow citizens to post to the Congress feed, but their posts need Speaker approval before they appear in the feed (and if Plato is really sporting, allow for a cash fine... hey, they get medal Gold!)
Could also be fun to have a Sanction Congress Member law proposal, that only the Speaker can propose, that mutes a congress member for 3 days on the feed.
The arguments and discussions is what makes congress fun.