https://www.reuters.com/article/us-facebook-f8conference/facebook-overhauls-design-as-it-pivots-to-private-messaging-idUSKCN1S627Q >Facebook Inc debuted an overhaul of its core social network on Tuesday, taking its first concrete steps to refashion itself into a private messaging and e-commerce company as it tries to move past scandals while tapping new revenue sources.