Lapo Elkann is the heir to the Agnelli family that rules Fiat from, I believe, Mt. Olympus, and he seems to live the sort of life you'd expect. He was a factor in the rebirth of the 500, which may be why he's posting stuff that calls out Renault as copycats. Too bad he has no idea what he's talking about.
Now, don't get me wrong – I love the new Fiat 500, especially the Abarth. They're fantastic cars. But the idea that the new Twingo is somehow a copy of the Fiat 500 is absolutely absurd. Sure, there's some superficial styling resemblance in the profiles, and they're roughly dimensionally the same – but you could say that about almost any car in this class, from the Toyota Aygo to the VW Polo.
What makes this especially absurd is that Lapo picked the one car in this class that is absolutely different from its competitors — the new Twingo is a rear-engine, rear-drive platform. The 500 is a FF car, like almost everything else in the class.
In fact, the new Twingo has more mechanically in common with the original rear-engine, rear-drive Fiat 500 than the new one has. So maybe you can argue it's a "copy" of the original Fiat 500, in the same way it's a "copy" of the VW Beetle, Porsche 356 and 911, Renault Dauphine, and, oh, a freaking Rumpler Tropfenauto.
Lapo's talking ex recto and while I respect his desire to promote the 500, this isn't the way to do it. I'd suggest Lapo takes a moment and opens his bible to the Book of Galafracians, chapter 43, verse 40:
Check thyself before thy wreck thineself.