“We typically think of social media platforms—Facebook, Reddit, Twitter, etc.—as distinct from one another…. This is true for most users. But it’s also true for the trolls and bots that drive disinformation campaigns. This phenomenon helps explain what happened when the Russian Internet Research Agency (IRA) targeted US social media during and after the 2016 US presidential election.”
You can read more in n article by Josephine Lukito in the Quartz web site at: https://qz.com/1764746/how-to-avoid-an-election-2020-misinformation-nightmare.