Matt Frei: ‘Likes, shares, engagement: on this common election the battle for hearts, minds and restricted consideration spans is being fought on social media, not simply the doorstep. The events are turning to TikTok specifically, hoping to win over the youth vote. Labour has already posted dozens of movies, some attracting tens of millions of views – whereas the Tories seem like struggling to maintain up. So which celebration is sizzling, and which isn’t.’