text:  It's All Things Considered from NPR News. I'm Scott Detrow. And I'm Juana Summers. This week, U.S. officials said they disrupted a Russian propaganda operation that used fake social media accounts posing as Americans. The Kremlin has used these kinds of bot farms before, but now artificial intelligence is making those efforts easier. NPR's Shannon Bond joins us to tell us more. Hey, Shannon. Hey, Juana. So, Shannon, start by telling us about this bot farm and the role that AI played.