{FD} Russian trolls and bots disrupting U.S. democracy via Facebook and Twitter

With top executives from Facebook, Twitter and Google testifying on Tuesday before a Senate Judiciary subcommittee on Russia’s attempts to influence U.S. elections and sow discord across the country via social media, many questions remain about how these Russian trolls operate, the veracity of the so-called news they are spreading and what tech giants in Silicon Valley are doing to combat this scourge.