CBS has done an excellent job with their Watch and Chat area called SocialRoom on their website where you can watch CBS TV shows (old and new) and chat at the same time. The selection is rather sparse but the concept is excellent.
Ultimately, we will see an option to turn on the social feature for anything we view online. The key is to give us the option to turn it on and off whenever we want. CBS provides that option so if you get tired of your chatty friends you can click an option to watch the show in peace.
However, I think adding the ability to experience video such as news or sporting events makes a great deal of sense in these interactive times. It’s not a matter of if but when.