Initial coin offerings – firms issuing their own digital currencies for investors to buy – are concerning regulators.

A look at some of the well-funded tech firms that have folded in 2017.

The drone, fitted with an infrared camera, was sent to scout out the nest.

The crypto-currency reaches $5,103.91 before a sell-off causes its value to sink.

New feature Tinder Gold lets users see who has liked them even if they haven’t matched.

The games company is told to pay $10m to a medical-device maker for infringing a motion-sensing patent.