(Ben Margot | AP file photo) This July 16, 2013, photo shows a sign at Facebook headquarters in Menlo Park, Calif. Beginning Thursday, Aug. 13, 2020 U.S. Facebook users who post about voting may start seeing an addendum to their messages — labels directing readers to authoritative information about the upcoming presidential election. It's the social network's latest step to to combat election-related misinformation on its platform as the Nov. 3 election nears — one in which many voters may be submitting ballots by mail for the first time.