by Chelsea StewartBuzzFeedBuzzFeed StaffI'm Chelsea, the Weekend Editor at BuzzFeed, where I cover everything from pop culture and politics to TV and celebrity news. People were NOT happy to see Mark Zuckerberg at UFC 326 last night. Alex Wong / Getty Images The billionaire Meta founder and martial arts practitioner was at Las Vegas's T-Mobile Arena for the event, where fighters Max Holloway and Charles Oliveira had their big face-off - but the crowd made it clear they weren't thrilled to see him.