https://www.theguardian.com/technology/2017/sep/21/instagram-death-threat-facebook-olivia-solon

After Guardian reporter Olivia Solon posted a screenshot of a profane email threat, it appeared on Facebook, encouraging viewers to follow her on Instagram

Instagram used a user’s image which included the text “I will rape you before I kill you, you filthy whore!” to advertise its service on Facebook, the latest example of social media algorithms boosting offensive content.