Zuckerberg admits Kenosha armed militia Facebook "event" should have been taken down

A Facebook event page promoting an "armed citizens'" vigilante action in Kenosha, Wisconsin, was only taken down after Tuesday night's shooting that killed two. CEO Mark Zuckerberg Friday blamed an "operational mistake" on the part of content moderators for the mistake. Jennifer Grygiel, social media expert and assistant professor of communications at Syracuse University, joins CBSN's Lana Zak to talk about this latest example of extremism on Facebook.