A lot of IRL violence starts with online radicalization. We revisit our conversation with writer and parent Joanna Schroeder, who wrote a guide for parents about what to look out for and how to intervene. This episode was produced by Avishay Artsy, edited by Matt Collette, fact-checked by Laura Bullard, engineered by Paul Mounsey, and hosted by Sean Rameswaram. Transcript at vox.com/todayexplained Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcasts Learn more about your ad choices. Visit podcastchoices.com/adchoices