A study released yesterday has led to numerous breathless headlines in the media about Russian bots on Twitter sowing discord about vaccines by spreading polarized antivaccine and provaccine messages. The stories imply that this is a huge problem. But is it? There's no doubt that this study showed some Russian bots Tweeting polarized messages about vaccines, but, contrary to the news stories, it doesn't support the concept of a widespread Russian effort to stoke conflict about vaccines. It's unclear whether the Russian effort was opportunistic or experimental, but it wasn't huge.