Recent days,To promote his new pet, Twitter, Musk once again "sold" Tesla stock.According to the latest documents from the U.S. Securities and Exchange Commission (SEC), Musk disclosed in the regulatory filing that he sold more than 19.5 million shares of Tesla stock, worth about $3.95 billion, over three trading days from November 4th to 8th. According to Twitter's second quarter report released earlier, its quarterly losses reached $270 million as of June, and its cash on the balance sheet was only $2.7 billion. This financial condition really needs new and old owners to infuse blood into it.Making money from one project to support the next is also consistent with Musk's habits.