vonnie: our thanks to jennifer dlouhy.llions of users around the globe, twitter has had trouble in the past dealing with abuse or harassment. we will discuss what the company is doing now to combat this particular issue. this is bloomberg. ♪ david: this is "bloomberg markets." time for the bloomberg business flash. the deal leading to the ouster of viacom ceo could be ehreatened by a legal battl between sumner redstone and his granddaughter. it is unclear whether the granddaughter had to agree to back the ceo. karen redstone is challenging her grandfathers mental competency. $33 a share in cash, a $.38 premium to the stock price as of august 3. spotify has been retaliating against musicians to doesduce new motility or -- musicians who introduce new music exclusively on other platforms by making it harder to find their music. twitter has long been criticized for failing to protect its users from of postst and abuse from users have led to the departure of many celebrities. working on a keyboard-based tool. sarah frier joins