As for platform discrepancies, the Android app has a RecentlyViewed pane which the iOS version lacks, but the latter offers recipe-sharing while the Android one doesn't.
The very same YouTube account also recently uploaded a moving, and criminally under-viewed, remembrance of Caleb that is entirely without attached advertising.
There has been a lot of talk recently about SnapChat, a smartphone app that allows people to share photos and videos that self-destruct after being viewed once for up to ten seconds.