It's been years since I last attended a proper concert, and back then, even bringing a cell phone to the arena was not allowed. And a camera? Forget about it! 

This Sunday, I saw MUSE in concert. Great show from a great band, but what struck me was how technology has changed the experience. A few
points:

• The arena, Oslo Spektrum, had an open wireless network, "muse", available for everyone. 
• A few people, granted, not many, tweeted before, during and after the show, and posted pictures to their Facebook profiles, thus instantly  spreading the word. 

This photo was taken at the beginning of the show. How many cameras and iPhones do you see?