Donald Trump made fun of Mark Zuckerberg behind his back, even as the billionaire tried to woo him by sending his children's letter that quoted Trump's election slogan, a book by NYT reporters revealed. While speaking with Zuckerberg's rival Elon Musk, Trump said, "[Zuckerberg] hated me...And look at them now." Musk felt delighted as Zuckerberg was mocked, saying, "First-class grovelling."