I saw someone hold up an iPad for an entire Bjork show on the row in front of me, live-streaming the gig to their friends on Facebook. Didn’t totally block my view but was definitely annoying and I thought especially rude as there were notes saying Bjork had specifically requested no cameras be used (it was a gig with just an orchestra so she wanted people to focus on the music). My friend had a word with them at the interval and they did move it out of our line of sight at least, lol