A.J. Brown, head of brand safety and advertising quality at Twitter, decided to leave the company, according to an informed source on Friday, the second manager in this department to leave in a matter of days, according to a report by Reuters.
The recent departure adds more challenge to the task faced by Twitter's new CEO Linda Yacarino, even before she takes the job.
Ella Irwin, Twitter's vice president of trust and safety, told Reuters on Thursday that she had resigned.
Erwin's work focused on content moderation efforts, and she often answered users about questions about suspended accounts.
Brown's job was to prevent ads from appearing next to inappropriate content.
Since Tesla CEO Elon Musk acquired Twitter in October, the platform has struggled to retain advertisers, who were worried about placing their ads after the company laid off thousands of employees.
Even before recent high-profile resignations in management, Musk was reducing the number of employees tasked with safety and content editing as part of the company's large-scale layoffs.
The AI ethics team, which was responsible for ensuring that harmful content was not recommended to users through algorithms, was fully laid off, CNBC reports.