Flickr Friendship + Group Network
A Flickr (photo-sharing) dataset of 80,513 users and 5,899,882 friendship edges, collected by Tang & Liu via Flickr crawl (2009). Each record contains user-user friendship edges, group memberships (195 groups), and user IDs. The dataset is notable for its classic photo-sharing social network with explicit group memberships, used as a benchmark for latent social dimensions. Intended for research into social network analysis, community detection, group membership prediction, and photo-sharing platform structure studies.
Cite this dataset at
flickr.echo.directory
Analytics
The full graph has 80,513 nodes; this view shows the 1,000-node sample the pipeline drew for display. Node size is centrality, colour is community.
Computed over the full corpus.
Record
- Catalog key
flickr- Authors
- Tang, Lei; Liu, Huan
- Year
- 2009
- Source paper
- Relational Learning via Latent Social Dimensions
- DOI / arXiv
- 10.1145/1557019.1557109
- License
- Academic Use (see Syracuse Data Lab terms) (LicenseRef-Research-Only)
- Records
- 80,513
- Nodes
- 80,513
- Edges
- 5,899,882
- Nodes are
- user
- Edges are
- friendship
- Attributes
- nodes have attributes; edges have no attributes
- Languages
- en
- Collected
- 2009 (2000s)
- Tasks
- From the graph: link prediction, community detection
- Region
- Global (inferred: the platform is used worldwide)
Provenance
- Originally published at
- https://datasets.syr.edu link checked
- Hosted copy
- Mirrored on echo.directory on 2026-10-09, 66.3 MB across 5 files. Checksums in MANIFEST.json.
Citations
Relational learning via latent social dimensions
Lei Tang, Huan Liu
Journal Article · Knowledge Discovery and Data Mining · 2009
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Jian-Xin Ma, Peng Cui et al. · International Conference on Machine Learning · 2019 · cited 387×
Citation data from Semantic Scholar, retrieved 2026-10-19.
How to cite
BibTeX
@misc{echo2026,
title = {ECHO: Exploratory Compendium of Humanity Online},
author = {Switzer, Braden and Zafarani, Reza},
year = {2026},
url = {https://echo.directory},
note = {Syracuse University}
}
@inproceedings{tang2009relational,
title = {{Relational Learning via Latent Social Dimensions}},
author = {Tang, Lei and Liu, Huan},
booktitle = {Proceedings of the 15th ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD'09)},
pages = {817--826},
year = {2009},
doi = {10.1145/1557019.1557109}
} APA
Switzer, B., & Zafarani, R. (2026). ECHO: Exploratory Compendium of Humanity Online [Data repository]. Syracuse University. https://echo.directory
Tang, L., & Liu, H. (2009). Flickr Friendship + Group Network [Data set]. https://doi.org/10.1145/1557019.1557109
MLA
Switzer, Braden, and Reza Zafarani. ECHO: Exploratory Compendium of Humanity Online. Syracuse University, 2026, echo.directory.
Tang, Lei, and Huan Liu. Flickr Friendship + Group Network. 2009, doi.org/10.1145/1557019.1557109.