I remember there was an episode on the podcast The Daily where Michael Barbaro interviewed a reporter who worked on the Harvey Weinstein story. I think they said that The New York Times had tried to pursue this story in the past, but they really wanted to make another push for it this year to expose the unreported stories of sexual harassment.
As another user posted I would say the university Facebook meme pages have filled the void left by Yik Yak: inside jokes for people in your school. It's not anonymous, but the general use case and type of content is very similar.