
WASHINGTON, DC - OCTOBER 31: Senate Judiciary Committee member Sen. Amy Klobuchar (D-MN) displays an inaccurate Tweet telling voters to cast ballots with text messages while she questions witnesses from Google, Facebook and Twitter during a Crime and Terrorism Subcommittee hearing in the Hart Senate Office Building on Capitol Hill October 31, 2017 in Washington, DC. The committee questioned the tech company representatives about attempts by Russian operatives to spread disinformation and purchase political ads on their platforms, and what efforts the companies plan to use to prevent similar incidents in future elections. (Photo by Chip Somodevilla/Getty Images)
It is virtually impossible to know how many people actually saw one of those posts.