Twitter’s head of brand safety and ad quality has left the company

Twitter lost its executive in charge of content moderation on the platform, Ella Irwin, earlier this week. In another sign of instability in Twitter's upper ranks, it looks like yet another top executive is leaving the company. The Wall Street Journal reports that A.J. Brown, who was in charge of Twitter’s brand safety and ad quality, decided to leave the company on Friday. Brown was reportedly in charge of making sure Twitter was a safe place for advertisers to place their ads. At the time of writing, she has not officially given a reason as to why she has decided to exit the company.