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Tendencies toward triadic closure: Field experimental evidence.

Mohsen Mosleh1,2, Dean Eckles2,3, David G Rand2,3,4

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Proceedings of the National Academy of Sciences of the United States of America
|June 30, 2025
PubMed
Summary
This summary is machine-generated.

Social network users are 35% more likely to form new connections when presented with a minimal cue of a mutual follower. This highlights the role of triadic closure tendencies in online social networks.

Keywords:
field experimentsocial network formationtransitivity

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Area of Science:

  • Social Network Analysis
  • Computational Social Science
  • Sociology

Background:

  • Empirical social networks exhibit high triadic closure, where neighbors of a mutual connection are also likely to connect.
  • Disentangling triadic closure from other mechanisms like homophily and exposure is challenging in many settings.
  • Social media platforms offer unique opportunities to decompose and study these network formation processes.

Purpose of the Study:

  • To experimentally isolate and quantify the effect of triadic closure tendencies on tie formation in social media.
  • To differentiate the impact of direct cues for triadic closure from other network formation drivers.
  • To investigate how pre-existing tie strength influences the likelihood of triadic closure.

Main Methods:

  • Conducted a field experiment on a social media platform.
  • Randomized the network structure presented to users when a controlled account followed them.
  • Implemented multiple control conditions to isolate the effect of a minimal mutual follower cue.

Main Results:

  • Users were 35% more likely to reciprocate a tie when randomly assigned to have an existing connection to the follower.
  • This effect was specifically attributed to the presence of a minimal cue indicating a potential mutual follower.
  • The tendency for triadic closure was stronger when the user had more prior interactions with the existing follower.

Conclusions:

  • Triadic closure tendencies play a significant role in social media tie formation, though potentially less than previously inferred from observational studies.
  • Minimal cues indicating mutual connections can substantially increase tie formation.
  • Understanding these tendencies has implications for network structure, information diffusion, and platform design.