https://www.reuters.com/article/tesla-musk-stake-shares/musks-twitter-poll-shaves-stock-price-and-raises-regulatory-questions-idUSKBN2HT0N9 >(Reuters) -Tesla Inc chief Elon Musk's Twitter poll proposing to sell a tenth of his holdings in the electric carmaker shaved around $60 billion off the company's market value on Monday and raised questions about whether he may have violated his settlement with the U.S. securities regulator again.