The ban will be enforced starting next week at the leading online social network and its image-centric messaging service, Instagram.
The social network said that concepts like these "have no place on their services."
Facebook policies already banned posts endorsing white supremacy
In a statement yesterday, the social network said, "It's clear that these concepts are deeply linked to organized hate groups and have no place on our services."
Facebook policies already banned posts endorsing white supremacy as part of its prohibition against spewing hate at people based on characteristics such as race, ethnicity or religion.
However, the ban had not applied to some postings.
Conversation with academics led to linking of white-nationalism to hate-groups
The ban had not applied to some postings because it was reasoned they were expressions of broader concepts of nationalism or political independence, according to the social network.
Facebook said that the conversations with the academics and "members of civil society" in recent months led it to view white nationalism and separatism as linked to organized hate groups.
'People will be able to demonstrate pride in their ethnic-heritage'
"Going forward, while people will still be able to demonstrate pride in their ethnic heritage, we'll not tolerate praise or support for white nationalism and separatism," Facebook said.
People who enter search terms associated with white supremacy will get results referring them to resources such as Life After Hate, which focus on helping people turn their backs on such groups, said the social network.
ML & AI
To curb hateful content, Facebook ramped up ML and AI
Amid pressure from governments around the world, Facebook in the past few years has ramped up machine learning and artificial intelligence tools for finding and removing hateful content, while remaining open to free expression.
"Unfortunately, there will always be people who try to game our systems to spread hate," Facebook said, adding, "Our challenge is to stay ahead by continuing to improve our technologies."
Ban wouldn't apply to topics like American pride, Basque separatism
Facebook said their challenge involves evolving policies and working with experts "who can bolster" their efforts. It said the new ban would not apply to topics such as American pride and Basque separatism, which "are an important part of people's identity," according to the statement.