J. Walter Thompson Worldwide unveiled its “Donate the Bars” project, which turns the black bars appearing on either side of vertical videos on YouTube into free ad space for charities. Working with partners Mashable House, GoodAmplified and Studio 71, J. Walter Thompson has enlisted popular YouTube creators Matt Santoro, Cody Simpson, Alli Simpson and Monica Church to participate “Donate the Bars.” One in six videos uploaded to YouTube don’t conform to the platform’s 16:9 aspect ratio, leaving black bars on either side of the image.