Who knew Kendall Jenner, a can of soda and a staged protest would be such a recipe for disaster? Certainly not Pepsi’s creative team, who are responsible for that spot. While the ad clearly missed the mark, it’s also a cautionary tale of the power of the crowd, and the tendency to revel in outrage.

The 2016 elections in the US and UK may be making headlines, but democracy's messy embrace now stretches far beyond politics, with social media offering people a say on almost anything. How can brands make the most of the consumer vote without ending up with egg on their faces?

Reddit is known as the home of cat pictures, conspiracy theorists and celebrity Q&A sessions. But as a place that encourages freedom of speech, Reddit also has a dark side, with plenty of offensive posts. It's now launched a blocking tool, letting users silence the trolls.

#DeleteUber marked a turning point in online activism, with social media users banding together to take the moral high ground against Uber's badly-timed promotion. But did people ditch the app because they genuinely disagreed with the brand’s actions, or so they could post about it on Instagram?