The apogee of Labour’s online audacity came on the Monday of election week, when the party paid £100,000 to place an advert with all seven million users of Snapchat, the most popular app with young voters. More than one million clicked on the link provided which told them where their polling station was. ‘It was just a turnout mechanism. We’ve never spent that money before on a single thing aimed at young voters,’ a Southside source said. ‘It really worked.’