Costa Coffee will broadcast live on the Costa Coffee’s Periscope channel, the Twitter-owned live broadcasting app, a barista battle to create the perfect coffee art. Viewers will be asked to vote for the winner, naturally. (Checks 'engagement' box). The pour-off will be broadcast live, today, on 29 September for an hour. This idea ties in with Costa Coffee’s "beautifully predictable" campaign, which centres on baristas’ ability to make the perfect coffee every time.