Tech chiefs are at the forefront of industry changes.
Top role vacated following a media report into CEO's private life.
Warren Webster takes over from David Plotz.
An updated list due to the epidemic
The social network initially revealed Project LightSpeed at F8 2019.
It 'hit a ceiling' on cable, but can now reach an additional 30 million viewers.
Knight Foundation-Gallup poll shows consensus across party lines
