Twitter owner and Chief Executive Officer Elon Musk told a Twitter Spaces conversation on Dec. 3 that Apple has fully resumed advertising on the social media platform. 

Near the end of November, Musk tweeted that Apple has "mostly stopped advertising on Twitter" with a question whether the company hates "free speech in America." Musk also claimed that Apple threatened to remove Twitter from its App Store without an explanation, following it with a Twitter poll asking if Apple should "publish all censorship actions it has taken that affect its customers." 

Following his meeting with Cook, Musk said his counterpart was "clear" that Apple never considered removing his company from the App Store. 

Twitter's advertising problems beyond Apple 

Even before the tensions with Apple, Twitter has been faced with other companies pulling out or reducing ad spending on the platform, particularly following Musk's takeover of the social media company in late October. 

Musk has since paused the verification program, with plans to revive it once concerns with imposters have been resolved. The next phase of the verification system is expected to include color-coded check marks that will distinguish the verified accounts for companies and government officials from those for individuals. 

Roughly 90% of Twitter's revenue is generated through advertisements. With big brands including the General Motors, General Mills, Mondelez, Volkswagen AG's Audi and Pfizer Inc. deciding to pause their ad spending in recent weeks, it is no wonder Twitter is scrambling to avoid further retreat from happening. 

To alleviate some concerns, Musk had also been reassuring advertisers both publicly and privately that Twitter will remain a safe space for brands. He also encouraged companies to publicly air their concerns about the site by tweeting at him.