Billionaire bets that NBCUniversal executive with Madison Avenue ties will bring advertisers back to TwitterUpdated May 12, 2023 4:13 pm ETEarly in the Covid-19 lockdown, a top executive at ad-buying giant GroupM called NBCUniversal ad chief Linda Yaccarino in a frenzy.Matt Sweeney, GroupM’s chief investment officer in the U.S., was desperately trying to get his Read More

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