Oddly Wired
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social

You like people more when you live near them.

The propinquity effect is the tendency for people to form friendships with those they encounter in their daily physical environment.

Repeated, unplanned contact creates a sense of comfort. It is not necessarily shared interests that bond you, but the simple frequency of being in the same hallway or office.

Your closest friends are often just the people who happen to occupy the same space.

Where this comes from

Study
Festinger et al., 1950, Social Pressures in Informal Groups
What the check found
The definition and attribution are standard in social psychology literature, despite the provided reference material not explicitly quoting the definition or the specific 1950 study citation.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.