Brian O'Kelly, CEO and co-founder of AppNexus, discusses Unilever's threat to pull its ads from Google and Facebook. Advertisers are growing increasingly frustrated by seeing their ads show up next to fake news and hate speech.

O'Kelly was in the room when an exec from Unilever made the threat, and O'Kelley says it was met with shock. O'Kelly believes no major brand would ever actually pull out of digital advertising.

O'Kelly explains the problem Google and Facebook currently have is "of their own creation." He adds "if they wanted to fix this, they could."