Walmart Media Group, now Walmart Connect, has launched a demand-side platform that provides data for ad targeting as it seeks to become a top 10 ad company (Alexandra Bruell/Wall Street Journal)

Facebook adds opt-in biometric fingerprint, face, or iris scan authentication for WhatsApp on desktop or web  —  WhatsApp, the Facebook-owned popular messaging app with more than 2 billion users, has been getting a lot of heat and losing users in recent weeks after announcing (and then delaying) changes to how it uses your data.