A former Facebook executive whose job focused on strategic partnerships with minority communities said the social media platform is failing black users, a problem he links to awkward interactions with black employees and managers.

The issues outlined in a memo that now-former Strategic Partner Manager Mark Luckie sent to Facebook employees before his departure and has since posted on the platform are occurring against a backdrop of concerns over privacy and data security as well as questions about the retention of an opposition-research firm to uncover information on George Soros after the Jewish billionaire criticized the Menlo Park, Calif.-based company.