When Zuckerberg is brought to Congress, he’s often asked questions about Facebook’s impact on mental health and addictiveness. Zuckerberg frequently answers by saying that Facebook’s north star metric is Meaningful Social Interaction (MSI), yet one employee, who was on the well-being team that was shut down, describes this metric as a marketing gimick. This employee shared internal metrics that more than 99% of Facebook usage is passive browsing, the kind that is more likely to reduce self-esteem, anxiety, and harm mental health.