Great move from Coldplay - stream their concert live. You might say, that's not news, but they do a couple of things right. http://www.coldplayaustralia.com.au/#/social-feed
First, they use a dedicated site they own, instead of one of the big companies. So I imagine, that the site will be still there when you read this post.
Second, they have a social stream and photos to give you beyond the music a way to experience it. In my opinion in a better way than even video would do.