Can you imagine that some techies in California start deciding which people are to be attacked in your country or by your country? It's also probably not techies that are deciding that but that's not the point.
That's such a nation security threat that no country with sane government can afford to allow. Wars, genocides can not only be facilitated but also initiated and commanded by these social media.
And considering all the Machiavellian thinking going on, you can actually expect things to be done. French wine is inconvenience for the Californian farmers maybe? The French lately aren't really that active with ad buys anyway, why not design timelines to induce social unrest in France giving a kick to the American winemakers?
It is known that Facebook studied manipulation of emotions through curation of the user timelines[0].
Also, isn't that against Apple's AppStore guidelines? Apple should remove Instagram and Facebook from the AppStore immediately.
[0] https://www.forbes.com/sites/kashmirhill/2014/06/28/facebook...