Homophily
birds of a feather — your network is way more inbred than you think
Grounded in the research on Wikipedia: Homophily / McPherson, Smith-Lovin & Cook, 'Birds of a Feather: Homophily in Social Networks' (2001)
name it
Homophily is the pull to connect with people like you — same age, race, class, school, taste, politics, hustle. "Birds of a feather flock together," turned into a measurable law of networks. It's not a vibe, it's the default gravity of who ends up in your phone. Left unchecked, your social graph quietly fills with copies of you, and you barely notice it happening.
the science
Sociologists Miller McPherson, Lynn Smith-Lovin and James Cook nailed it in their 2001 paper "Birds of a Feather," reviewing decades of network data. Their finding: similarity breeds connection in basically every tie — friendship, marriage, work, advice. Race and ethnicity create the sharpest divides, then age, religion, education, gender. The term goes back to Lazarsfeld and Merton in 1954. This isn't a hot take; it's one of the most replicated facts in social science.