"Because the chatbots were almost entirely anonymous and were frequently bought in secret from companies or individual programmers, it was not possible to directly link the activity to either campaign, except for a handful of “joke” bots created by Mrs. Clinton’s campaign, they noted.Automated Pro-Trump Bots Overwhelmed Pro-Clinton Messages, Researchers Say - The New York Times
However, there was evidence that the mystery chatbots were part of an organized effort.
“There does seem to be strategy behind the bots,” Dr. Howard said. “By the third debate, Trump bots were launching into their activity early and we noticed that automated accounts were actually colonizing Clinton hashtags.”"
Friday, November 18, 2016
Automated Pro-Trump Bots Overwhelmed Pro-Clinton Messages, Researchers Say - The New York Times
But no need for concern, because, later in the article, "“Anyone who claims that automated spam accounts that tweeted about the U.S. election had an effect on voters’ opinions or influenced the national Twitter conversation clearly underestimates voters and fails to understand how Twitter works,” said Nick Pacilio, a Twitter spokesman."