There's a great post on PlasticBag about social software for settop boxes. Where are the points where television and PVR use meetup with Skyping?

• Share my Skype buddy lists. The Skype network is both huge and international. Save me from duplicating effort yet again; let me use my Skype contacts in my TV's buddy list.
• Use the Skype network for presence. Skypespace can inform my TV's settop box of who's connected, in what mode, and where. This should allow me to watch socially even if I'm on a different cable network.
• Trigger live conversations. Let my TV show me that five of my buddies are watching the semifinals live. Then give us the option to chat or conference call.
• Share media. Snapshots, audio clips, and video clips from the show with my buddies. Make it easy, no more than 2-3 clicks.

What else?