Couple of key updates for the 1.1 version of Twitter's pithy video app, Vine. First up is support for front-facing cameras, for those who can't get enough short web videos of themselves. Tap the icon in the lower-left corner of the app and it will toggle between your phone's cameras. Also new is mention support, so those tagged with an @ will get a notification when you drop their names into a post. The latest version is available now from iTunes -- perhaps a short video of you downloading the update is in order.