The Twitter has issued a series of subpoenas for some of Silicon Valley's most prominent names in its legal battle against Elon Musk. According to sources, Twitter sent legal requests recently to billionaire investors Chamath Palihapitiya (and Marc Andreessen). TheTwitter also subpoenaed one the entrepreneurs, who helped Musk found PayPal, David Sacks and SpaceX, along with investors Joe Lonsdale, Keith Rabois and Jason Calacanis. These legal requests could force the men to testify before the courtroom when the five-day trial begins in October.