Taking photos inside a museum

This is not my usual type of post, but I have thought I do not write enough.

A question arose (in the middle of the night) whether an art gallery/museum is doing itself a disservice by not allowing photographs to be snapped by its attendees of a feature exhibition. The photos typically wind up on Facebook or Flikr as a free cultural advertisement, and those struck by this would naturally want to partake in similar activities.

I wonder if I can say this about taping of an orchestra symphony... perhaps not, what do you think?

xo