Facebook has announced a ban on any posts praising or supporting white nationalism and white separatism.
The company says it will begin enforcing the ban next week.
It will also apply to content posted on Instagram.
In a statement, the social network said: "It’s clear that these concepts are deeply linked to organised hate groups and have no place on our services.
"While people will still be able to demonstrate pride in their ethnic heritage, we will not tolerate praise or support for white nationalism and white separatism."
They suggested that the concepts "cannot be meaningfully separated" from white supremacy.
Facebook also says that anybody searching for terms linked with white supremacy will instead be directed to Life After Hate - a group formed by former extremists to provide education and support services.
Social networks have found themselves under increased pressure to take actions against hate speech and extremist content in the wake of the New Zealand mosque shootings.
The attack, which left 50 people dead, was live-streamed by the shooter.
New Zealand's Prime Minister Jacina Ardern welcomed Facebook's announcement, but suggested more needs to be done.
In comments quoted by the AFP news agency, she said: "Arguably these categories should always have fallen within [Facebook's] community guidelines on hate speech.
"But it's positive that clarification has now been made in the wake of the attack here in Christchurch."
Ms Ardern called for a global approach to tackling the issues, suggesting:
"There are lessons to be learned here in Christchurch and we don't want anyone to have to learn those lessons over again."
