https://www.reuters.com/article/us-usa-election-twitter/facebook-twitter-step-up-fight-against-misinformation-on-u-s-elections-idUSKCN2590FU >Social media platforms stepped up fight against misinformation on the U.S. elections, with Facebook starting a hub to help users with poll-related resources and Twitter expanding rules against misinformation on mail-in ballots and early voting.