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At least three mass shootings this year \u2014 including one in El Paso \u2014 have been announced in advance on the online message board 8chan, often accompanied by racist writings. We look at the battle over shutting down the site. Guests: Kevin Roose, who writes about technology for The New York Times, spoke with Fredrick Brennan, the founder of 8chan. For more information on today\u2019s episode, visit nytimes.com/thedaily.\xa0\n\nBackground reading:Fredrick Brennan started 8chan as a free speech utopia. But the site became known as something else: a megaphone for mass shooters, and a recruiting platform for violent white nationalists.Several tech providers pulled support for 8chan, temporarily taking the site offline. The decision to do so was not a straightforward one for the security company Cloudflare.