Social relationships form the foundational infrastructure of human well-being and psychological health. Strong connections help protect against daily stress and build lifelong emotional resilience. Conversely, social isolation is tied to a host of physical and mental health vulnerabilities. While familial interactions and romantic bonds see plenty of academic attention, platonic friendships are just as vital to a long and healthy life. Friendships offer unique psychological benefits compared to other types of social ties. Relationships with relatives often carry rigid biological or cultural obligations, and romantic partnerships are typically weighted with intense emotional expectations. A platonic friendship is a lower-pressure environment where people can engage in voluntary self-disclosure. These relationships provide a safe arena to practice social skills and find comfortable, judgment-free companionship. Because establishing a friendship is an entirely voluntary process, a major ingredient in building that relationship is perceived similarity. People naturally gravitate toward strangers who share their personal values, core beliefs, and behavioral quirks. Once a bond is established, friends tend to naturally evaluate each other as being much like themselves. However, specialized …