Sorry, I'm aware that yelling is not appreciated, but this is a really cool idea.
There's hardly anything more annoying at gigs than those dunces in front of you recording some ultra-shitty video that nobody ever looks at.
Those small screens are a real distraction and phones also don't really serve as substitutes for lighters used, when Led Zeppelin started with Stairway to Heaven.
A rant about this specific song is reserved for another comment.