I began to reconsider this question as I walked from The Orpheum Theatre in San Francisco this week. I was among several hundred lucky people who got to see the first open dress rehearsal of the mega-hit musical Hamilton. We didn't have to pay, because the production wanted an audience to warm them up for their extensive run.
Before the show began, Director Thomas Kail introduced himself, and asked us not to Tweet or Facebook or Instagram our experiences. Because offering opinions about a show before it opens is just bad form.
But Kail also expressed that the experience of seeing this live production (a beautiful one, by the way, but don't mistake that for a review) was a shared experience that cannot be recreated through social media.