A.J. Brown, head of brand safety and ad quality at Twitter, has chosen to leave the company, according to a source with knowledge of the situation on Friday. Brown is the second safety leader to leave the firm in recent days.

Even before she assumes her new position, the most recent departure heightens the difficulty for Linda Yaccarino, the incoming CEO of Twitter.

Ella Irwin announced on Thursday that she was leaving her position as vice president of product for trust and safety at the social media firm, where she oversaw efforts to moderate material and frequently answered queries from users regarding accounts that were suspended.

A.J. Brown, head of brand safety and ad quality at Twitter, has chosen to leave the company, according to a source with knowledge of the situation on Friday. Brown is the second safety leader to leave the firm in recent days.

Even before she assumes her new position, the most recent departure heightens the difficulty for Linda Yaccarino, the incoming CEO of Twitter.

Ella Irwin announced on Thursday that she was leaving her position as vice president of product for trust and safety at the social media firm, where she oversaw efforts to moderate material and frequently answered queries from users regarding accounts that were suspended.