Vanity Fair's site, you can zoom in on the people in this photo, and they are identified. I've been hearing about this photo for a while, nice to finally see it. Of course most of the "comments" are negative ones, because people just HAVE to be jerks. I think it was nicely done myself, and I especially enjoyed the nostalgic pairings, like John Travolta and Olivia Newton-John and Ryan O'Neal and Ali MacGraw.
At the bottom of this article is a video showing the gathering.