The major social media firms have taken a largely piecemeal and fractured approach to managing the problem.
Experts explain five big threats to this year's election, from Russian interference to voter intimidation at the polls – plus some tips to make sure every vote is counted.
Laws that have long kept campaigners away from voters at polling places may not work in a world where a T-shirt symbol can be interpreted as campaigning.
An analysis of 55 countries shows voter turnout is lowest among women, the young, poor voters and those with less education.
The 2020 presidential election will be the first in nearly 40 years conducted without protections from a court order that forbid the GOP from using voter intimidation at the polls.