Elon Musk, the billionaire entrepreneur, is back to tweeting about Bitcoin and insulting the top cryptocurrency. Musk posted a meme that many mistook for a hint about a future Bitcoin split. Following Musk's tweet, the price of Bitcoin fell below $38,000 for a brief period. Tesla's $1.5 billion bitcoin purchase has sparked curiosity because Musk declared the electric car firm would no longer accept Bitcoin as a form of payment for its vehicles.