Vertical video ads are coming to YouTube

YouTube is embracing vertical video ads to let brands "provide a more seamless mobile experience" for viewers, it revealed at Dmexco today (12 September) where it also revealed plans to sell advertisers video ads based on users' personalised home feeds.
Advertisers can now snap up slots that fill up a users' screen when they're viewing content on YouTube's mobile app in a similar way to the ads served by the likes of Instagram and Snapchat. 
When viewers tap on a ve