The characters in director Fatih Akin’s movies are flawed, they use drugs, they take a contrarian approach to life, they survive life rather than live it (and they listen to fantastic music). While studying the humanities in college Katja (Diane Kruger, in a very strong performance) enjoyed the instant gratification of chemicals and fell for her drug dealer, the virile and handsome Nuri (Turkish-German actor Numan Acar).

Is social media a waste of time, as David Remnick said? Maybe so. But Twitter, Instagram and the rest make keeping up with other people's lives easy and free. Where the Cannes festivalgoer is concerned, a spur-of-the-moment video on Instagram by a filmmaker can potentially add insight into what they're experiencing. At the same time, it's important not to lose touch of the fact that social media is often as vapid as it is useless