that, indeed, undecided people respond differently to arguments than entrenched people, and that the responses of undecided people correlate with personality. We show that this holds across an array of different arguments. Our research questions are:

-   Can we mine social media to find arguments that change people’s beliefs?

-   Do different argument types have different effects on belief change?

-   Do personality and prior beliefs affect belief change?

-   Are different personality types differently affected by factual vs. emotional arguments?

Our results show a small but highly reliable effect that short arguments derived from online dialogs do lead people to change their minds about topics such as abortion, gun control, gay marriage, evolution, the death penalty and climate change. As expected, opinion change is greater for people who are initially more neutral about a topic, than those who are entrenched. However personality variables also have a clear effect on opinion change: neutral, balanced arguments are more successful with all personality types, but conscientious people are more convinced by dialogic emotional arguments, and agreeable people are more persuaded by dialogic factual arguments. We describe how we use plan these findings to select and repurpose social media arguments to adapt them 