The more I think about the idea of merging the first and second screens around big events, the more I think it's got to happen. Everyone is so ready for it, except for perhaps Twitter and the companies with the killer apps, the TV networks. The users are way way ready for much more than what either tech or TV industries are offering.
The killer product is the merger of a big hit like Mad Men, Game of Thrones, Breaking Bad, or next year's killer HBO-AMC-Showtime blockbuster.
When it's time for the show to air, the new network becomes activated. Everyone leaves Twitter, which becomes a ghost town while the show is on.
It could be the SuperBowl or the NBA Playoffs. The World Series, US Open, Election Night. The Olympics. Any huge event that draws large attention from Twitter users.
The thing you got that no one else has -- the show that everyone's talking about.
No spoilers, completely free discussion. Everyone has the context. It's right there.
Here's a screen shot to give you a very rough idea of what it might look like.
Now Twitter can do this, if they can do a deal with the sources of the programming, or the programmers can route around Twitter and use this as a way to boot up a second network, or third or 23rd. If cable can support lots of channels so can the TVitterverse.