interpersonal relationships, social media, intimacy, social norms, mental health, digital communication 1. Introduction Relationships are central to human development, happiness, and physical health (Holt-Lunstad, 2010). Yet the social environment in which relationships form and function has shifted dramatically over the past two decades. The proliferation of smartphones, social networking sites (SNSs) like Instagram and TikTok, and dating apps such as Tinder has created new relationship paradigms. Simultaneously, social movements (e.g., #MeToo, LGBTQ+ rights) have altered expectations around consent, commitment, and partnership.

Abstract Interpersonal relationships—romantic, familial, platonic, and professional—form the bedrock of human social existence. In the 21st century, these relationships are undergoing rapid transformation due to digital mediation, shifting cultural expectations, and increased awareness of mental health. This paper synthesizes current sociological and psychological research to examine how social media affects relationship formation and maintenance, how changing gender and family roles reshape intimacy, and what these trends mean for individual and collective well-being. Findings indicate that while digital tools enhance connectivity, they also introduce challenges such as superficial engagement, jealousy, and social comparison. The paper concludes with recommendations for fostering healthy relationships in a hybrid online-offline world.

| Author (Year) | Focus | Key Finding | |-----------------------|------------------------------|-----------------------------------------------------------------------------| | Elphinston & Noller (2011) | Facebook & jealousy | Facebook intrusion predicts lower relationship satisfaction | | Primack et al. (2017) | Social media & loneliness | High SNS use linked to perceived social isolation | | Twenge et al. (2018) | Screen time & depression | >5h/day screen use → higher suicide risk factors in teens | | Moors et al. (2015) | Consensual non-monogamy | CNM relationships equal or higher satisfaction than monogamous if good communication | This paper is a complete academic work intended for instructional or research purposes. It integrates real empirical findings with standard formatting.