Rolf Vennenbernd/picture alliance via Getty Images; Chip Somodevilla/Getty Images
- Jack Dorsey feared for his parents' safety after Twitter banned Donald Trump, a new book says.
- His parents reportedly received threats that led Twitter to increase security at their home.
- Some tech companies drop millions of dollars on security for CEOs and their families.
Twitter cofounder Jack Dorsey was concerned about his parents' safety after his company banned former President Donald Trump from the platform, according to a recent book on the social media company.