The social network company is facing accusations from more than 200 workers from around the world who claim to have been forced back to work, despite the threat of the ongoing health crisis.
In an open letter, the Facebook employees said: "After months of allowing content moderators to work from home, faced with intense pressure to keep Facebook free of hate and disinformation, you have forced us back to the office.
"Facebook needs us. It is time that you acknowledged this and valued our work. To sacrifice our health and safety for profit is immoral."
Facebook said in August that staff could work from home until the summer of 2021.
However, the tech giant - which is allowing "a majority" of content reviewers to work from home - also relies on thousands of contractor workers, who are officially employed by other companies.
Facebook has now clarified its position on the home-working situation.
In a statement, Facebook said: "While we believe in having an open internal dialogue, these discussions need to be honest.
"The majority of these 15,000 global content reviewers have been working from home and will continue to do so for the duration of the pandemic."