https://www.reuters.com/article/us-facebook-f8conference/facebook-overhauls-messaging-as-it-pivots-to-privacy-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 a stream of scandals while tapping into new revenue sources.