The El Paso Gunman's Manifesto Was Posted Online. What Role Has The Internet Played In Shootings?

Just 19 minutes before the shooting in El Paso over the weekend, a 2,300 word anti-immigrant manifesto was posted to the online message board 8chan. It talked about a "Hispanic invasion of Texas," and authorities now believe it was written by the shooter that fatally shot 21 people on Saturday at a Walmart in El Paso.

Here & Now's Jeremy Hobson talks with Derek Thompson (@DKThomp), a senior editor at The Atlantic, about the shooting and the role of the Internet and certain online forums.