He's at the helm of a matchmaking empire, but Hinge founder Justin McLeod is an unlikely tech guru.

Justin McLeod is flicking through my dating app profile and scratching his neatly trimmed beard. "I'm guessing this one probably gets you the most comments, right?" he says, looking at one of the "prompts" I've included. On Hinge - the fastest-growing dating app in the UK - users are provided with a series of questions to answer and feature on their profile, ranging from the jaunty "most embarrassing song on my Spotify" to the slightly more personal, "I get along best with