We plan to add the ability to connect an existing account too, but please bear with us while we get that up and running.
Beta users can currently automatically Tweet the programmes they favourite and watch. For now, unfortunately, you need to sign in to Twitter separately for that. It's clunky, but it's just temporary, and hopefully you beta users are a tolerant lot....
Down the line we'll be using these social features to make it much easier to share the online TV programmes you enjoy.
Update as regular users might have seen, we've had a bunch of issues the last few days, and as part of trying to track that down we've backed out the social network connection change for now