In 2012 after being sexually harassed on London public transport a young journalist started to collect stories for a piece she was writing on the issue. Astounded by the response she received and the wide range of stories that came pouring in from all over the world, she quickly realised that the situation was far worse than she’d initially thought. Sexism is endemic – socially, politically and economically. And enough is enough. Welcome to the fourth wave of feminism.