While social media platforms took steps to limit disinformation related to the 2020 US election, their efforts were not fully effective. Facebook labeled some of Trump's posts spreading doubts about mail-in voting, but a late November speech where he discussed electoral fraud was still viewed millions of times on Facebook and YouTube. Domestic groups spreading disinformation about election fraud on social media may have had a larger influence than foreign interference, and led to the January 6th attack on the US Capitol. The platforms' labeling of disputed claims did little to curb the spread of rumors and disinformation.