So I've played a couple of linked youtube videos from the forums through my Bungie Mobile app. However, when I try to play it, the video works but there is no audio. I'm running the app on an iPhone 4 with iOS 6.1.3 [Edit: I figured out the sound is muted when my phone is switched to vibrate. Was this an intentional design decision? I know in other apps, such as Digg and Reddit, audio will play when I stream a video in app.]