Lies and unfounded allegations about the U.S. election are not going anywhere. And though we talk about Facebook and Twitter a lot, critics say YouTube hasn’t been doing nearly enough to prevent the sharing of videos that make false or misleading claims. It’s hard to overestimate just how big YouTube is. Over a quarter of U.S. adults get news from it. Amy Scott speaks with Rebecca Heilweil, a reporter for Vox’s “Open Sourced” project.