"Russian agents intending to sow discord among American citizens disseminated inflammatory posts that reached 126 million users on Facebook, published more than 131,000 messages on Twitter and uploaded over 1,000 videos to Google’s YouTube service, according to copies of prepared remarks from the companies that were obtained by The New York Times. The detailed disclosures, sent to Congress on Monday by companies whose products are among the most widely used on the internet, came before a series of congressional hearings this week into how third parties used social networks and online services to influence millions of Americans before the 2016 presidential election."