Can anyone confirm that the shared photo stream feature has been updated such that streams are now collaborative. One of the main flaws (in an otherwise great feature) is that if I create a stream for a bunch of friends I'm the only one that can add photos to it. They may all have taken their own pictures of the same event but would all have to create their own stream in order to share them. Having one stream that we can all add to makes much more sense. I read that this was a new feature but haven't seen anyone confirm. Thanks.