In 'The Social Network', which actor plays Mark Zuckerberg?

Who played Ken in 'Barbie' (2023)? Who played Sebastian in 'La La Land'? Who played Andrew in 'Whiplash' (2014)? Which actor won an Oscar for playing the music teacher in 'Whiplash'? In 'Top Gun: Maverick' (2022), which actor plays Rooster? In 'Rocky', what is the name of Rocky's girlfriend and later wife? In 'Rocky', who is Rocky's opponent in the heavyweight title fight? In 'Rocky IV', who is Rocky's Soviet opponent?