I got a bit annoyed about this. I asked for the photo of my tattoo (Screamadelica) to be removed from a website which was taken at a Primal Scream gig. It was. My privacy is pretty important. It was an adventure, I suppose. I found it imposing though. I know the law says differently, but one does not want one's ugly mug on the internet without permission. I don't mind people seeing it, but with permission. Andrew Weatherall thought it is fantastico!
Tickets usually say "you may be filmed". I never want to be though. Act natural.