Facebook said it planned to make some 3,000 political announcements that made it clear that Russian-based elements had been posted on its social networking site in the months before and after the US presidential election.
The company's chief executive, Mark Zuckerberg, said in a live broadcast on Facebook that he supported the congressional inquiry. Zuckerberg is under pressure to do more to prevent the use of the site in election manipulation.
Zuckerberg outlined nine steps he said Facebook would take to deter governments from using the world's largest social networking network to intervene in elections.
He added that Facebook will make political ads on the site more transparent so that people can see which ads appear in connection with an election.
"The social media does not disclose the content under any circumstance, but the company wants to help protect the integrity of the US election," legal adviser to Facebook Colin Strech wrote in a separate article.
"We think the public deserves a full account of what happened in the 2016 election," he wrote.