Dark arts and dirty tricks: the 2019 general election online

Media editor Jim Waterson tells Anushka Asthana how political parties are pushing the limits of what is allowed in the unregulated space of social media. Plus: Sabine Rennefanz on the 30th anniversary of the fall of the Berlin wall. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>