Someone I know is spreading race hate (as well as Islamophobia - separate kind of hate, I understand) on social media. I have "reported" some of most recent posts on Facebook (before blocking the person). Facebook agreed that the posts breached their standards and have notified the person. I understand from others that this person continues to post hate-mongering stuff on Facebook.
They work in a very "customer-centric" in the heart of a very diverse community. Would you report this person anonomously to their employer? There is a whiteblowing procedure in place. Their employer is very hot on equality, diversity, respect for all etc.