Loneliness not only affects how we feel in the moment but can leave lasting imprints on our personality, physiology, and even the way our brains process the social world. A large study of older adults [found] that persistent loneliness predicted declines in extraversion, agreeableness, and conscientiousness"traits associated with sociability, kindness, and self-discipline. At the same time, higher levels of neuroticism predicted greater loneliness in the future, suggesting a self-reinforcing cycle. Although social media promises connection, a large-scale study published in Personality and Social Psychology Bulletin suggests that it may actually fuel feelings of loneliness over time. Researchers found that both passive (scrolling) and active (posting and commenting) forms of social media use predicted increases in loneliness. Surprisingly, even active engagement"often believed to foster interaction"was associated with growing disconnection. Even more concerning was the feedback loop uncovered in the data: loneliness also predicted increased social media use over time, suggesting that people may turn to these platforms for relief, only to find themselves feeling even more isolated. Lonely individuals also showed greater activation in areas tied to negative emotions, such as the insula and amygdala. This pattern suggests that lonely people may be more sensitive to social threat or negativity, which could contribute to feeling misunderstood or excluded.