https://arstechnica.com/tech-policy/2021/04/it-took-facebook-two-months-to-realize-stop-the-steal-might-turn-violent/

It took Facebook less than two days to shut down the original “Stop the Steal” group but two months for it to realize that the group and its offspring had spawned a “harmful movement” that thrived on the platform and would ultimately lead to violence.

The news comes from a Facebook internal report analyzing the company’s response to the events leading up to and culminating in the January 6 insurrection at the US Capitol. Reporters at BuzzFeed News obtained the report, titled “Stop the Steal and Patriot Party: The Growth and Mitigation of an Adversarial Harmful Movement,” and published the document today after Facebook reportedly began restricting employees’ access to it.