Elon Musk has posted a meme comparing Canadian Prime Minister Justin Trudeau to Adolf Hitler . The Tesla and SpaceX figurehead is widely known for his social media exploits; yes, he's probably the biggest name in electric cars today, but he can also create volatile rifts in the stock market with a single meme , or even the name of his dog. Any comment on current affairs is usually rather flippant or brief (he once responded with a laughing emoji to claims Jeff Bezos' Blue Origin ripped off his space firm), so his newest meme is par for the course...