The briefest of snippets from The Day of The Doctor raises plenty of questions...

The clip comes from the BBC's new Hashtag initiative, Save The Day, which tasks Whovians across Facebook and Twitter to tag their Who-related posts and images with #savetheday in order to build a spangly 3D image of the TARDIS, as well as reveal sneak preview clips from the anniversary episode. Here's the Eleventh Doctor extolling the virtues of the Hashtag (quite odd for someone who wasn't fond of Twitter shenanigans earlier this year in The Bells of Saint John):