Summary: Facebook and its group of apps and social media platforms like WhatsApp and Instagram were down most of Monday. The outages come on the eve of another difficult congressional hearing for the social media giant. The cause of the outages still has not been explained. Sheera Frenkel of The New York Times reports on Facebook extensively and joins William Brangham to discuss. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
