Some Facebook users in France have spotted a new feature in the Messenger app. They're seeing an hourglass in the top-right corner of a conversation that when tapped sets messages to self-destruct in one hour's time. Facebook says that it's testing this new feature in France and might roll it out to everybody if users embrace it. If this all feels a little familiar, that's probably because it's very similar to Facebook's own Slingshot app. And if that seemed familiar, that's because it was a pretty direct take on what Snapchat has been doing since it launched in 2011. Facebook attempted to buy Snapchat in 2013 for a rumoured $3 billion dollars, but Snapchat CEO Evan Spiegel refused the offer. So it seems like Facebook has adopted the mentality that if you can't buy them, beat them.