If I watch a Youtube video in Shazam or other apps, and if I want to share it or bookmark it, I have to go the native Youtube app (and find the video) or email the tag instead of emailing the video itself. It makes it hard to share. Any Youtube video in any app (or mobile Safari) should have either the Bookmark/Share buttons like the native Youtube app or the ability to open Youtube videos from other apps in Youtube (like an 'i' button that takes you straight to the Youtube app).