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Exploring variation in active network size: Constraints and ego characteristics
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“Social networks provide practical and emotional support as well as providing a means of gaining new information and disseminating the cultural knowledge crucial for human survival [7–11].”
From The ice-breaker effect: Singing mediates fast social bonding (2015) · cites this paper as [11]
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Cites
Granovetter, M. S. (1973) · American Journal of Sociology · doi:10.1086/225469 · Cited by 40,491
Discovering Statistics Using SPSS
Field, A. P., & Miles, J. N. V. (2000) · Medical Entomology and Zoology · Cited by 28,269
Social network sites: definition, history, and scholarship
boyd, D. M., & Ellison, N. B. (2007) · Journal of Computer-Mediated Communication · doi:10.1111/j.1083-6101.2007.00393.x · Cited by 16,251
Ellison, N. B., Steinfield, C., & Lampe, C. (2007) · Journal of Computer-Mediated Communication · doi:10.1111/j.1083-6101.2007.00367.x · Cited by 9,939
Cohen, J. (1992) · Psychological Bulletin · doi:10.1037//0033-2909.112.1.155 · Cited by 8,771
The Strength of Weak Ties: A Network Theory Revisited
Granovetter, M. (1983) · Sociological Theory · doi:10.2307/202051 · Cited by 8,263
Building a Network Theory of Social Capital
Lin, N. (2017) · Routledge eBooks · doi:10.4324/9781315129457-1 · Cited by 3,832
Ainsworth, M. S. (1989) · American Psychologist · doi:10.1037/0003-066x.44.4.709 · Cited by 3,231
Discovering statistics using SPSS, 2nd ed.
Field, A. P. (2005) · Cited by 2,558
Coevolution of neocortical size, group size and language in humans
Dunbar, R. (1993) · Behavioral and Brain Sciences · doi:10.1017/s0140525x00032325 · Cited by 2,370
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Metadata
- Authors
- Roberts, S. G. B., Dunbar, R. I. M., Pollet, T. V., & Kuppens, T.
- Affiliations
- University of Oxford (GB)
- University of Groningen (NL)
- UCLouvain (BE)
- Corresponding author
- Roberts, Sam G.B.
- Venue
- Social Networks
- Publisher
- Elsevier BV
- Published
- 2009-05
- Volume
- 31
- Issue
- 2
- Pages
- 138-146
- ISSN
- 0378-8733 (ISSN-L)
- OpenAlex
- W2100637281
- Cited by
- 428
- References
- 74
- Citations by year
- 2026: 10 · 2025: 14 · 2024: 12 · 2023: 9 · 2022: 22 · 2021: 80 · 2020: 31 · 2019: 20 · 2018: 31 · 2017: 29 · 2016: 31 · 2015: 36 · 2014: 24 · 2013: 20 · 2012: 24
- FWCI
- 63.86
- Type
- journal article
- Language
- en
- Open access
- green
- www.elsevier.com
- Licence
- cc-by-nc-nd
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- Locations
- Social Networks (publishedVersion)
- University of Groningen research database (University of Groningen / Centre for Information Technology) (publishedVersion)
- DIAL (Catholic University of Leuven) (submittedVersion)
- ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
- Northumbria Research Link (Northumbria University) (submittedVersion)
- University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion)
- Oxford University Research Archive (ORA) (University of Oxford) (submittedVersion, cc-by-nc-nd)
- Funders
- Engineering and Physical Sciences Research Council
- Research Institute for Microbial Diseases, Osaka University
- Topics
- Social Sciences › Sociology and Political Science › Social Capital and Networks
- Social Sciences › Psychology › Social Psychology › Attachment and Relationship Dynamics
- Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Complex Network Analysis Techniques
- Keywords
- network size, emotional closeness, network composition
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