In the lead-up to last week’s March for Life rally, Twitter generated controversy for censoring at least two different pro-life tweets, including one by Rep. Matt Gaetz, masking them from view with a “sensitive content” warning. After the ensuing outcry, the company followed the now-standard playbook of blaming algorithmic “error” and removed the warnings. Still, Twitter refuses to provide any additional detail about how the error occurred. As social media platforms increasingly become the “public spaces” through which democratic debate occurs, the errors and inadvertent biases of their moderation black boxes will have an ever-growing impact on democratic debate.