Glance, a new feature on Apple Watch that lets wearers skim through tiny notifications, presents a new challenge for the media industry already struggling to capture diminishing attention spans in constrained screen sizes: “glance media”.

"People think it's just an app that says 'Yo,'" Yo founder Arbel told the New York Times. "We like to call it context-based messaging.” Effectively, Yo really is just an app that says 'Yo'. So why has it already been used four million times and attracted $1 million of investment?

Apple is hoping that Apple Pay, a tap-to-pay service integrated into the iPhone 6 and Apple Watch, will help it dominate the $79.2 billion-a-year digital payments market. But can Apple succeed where so many have failed before, and truly replace our wallets with our phones?

As the world goes mobile, almost every brand has a social media presence. With 15-second Instagram videos set to dramatic music, the BBC is taking a modern, bite-sized approach to news that’s ideal for small screens.