As young people flock to WhatsApp, LINE and other chat apps, Facebook struggles to stay relevant. In response, it's created better emoticons – called Stickers – that are part of a deeper shift towards pictures as a primary way to communicate.

In a hyper-connected world, we’re just a Google away from the answer to any question. But as people turn away from impersonal algorithms, photo-based Q&A app Jelly is finding a foothold, crowdsourcing knowledge from the people you know and trust.

Mobile dating app Tinder simplifies an increasingly complicated hookup culture, appealing to online dating sceptics and millennials alike by minimising the chances of rejection.

Stickiness is one of the core principles of web design, which is still used to measure a product's success. It's also key to achieving brand objectives. Daniel Nye Griffiths unpacks the dynamics behind some sticky apps and games.