BlogCatalog Friendship Network
A BlogCatalog (blogging social network) dataset of 88,784 bloggers and 2,093,195 friendship edges, collected by Agarwal et al. via BlogCatalog crawl (July 2009). Each record contains blogger-blogger friendship edges and user IDs. The dataset is notable for its classic blogosphere friendship network used for familiar stranger detection and social identity research. Intended for research into social network analysis, community detection, familiar stranger identification, and blogosphere structure studies.
Cite this dataset at
blogcatalog.echo.directory
Analytics
The full graph has 88,784 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
blogcatalog- Authors
- Agarwal, Nitin; Liu, Huan; Murthy, Sudheendra; Sen, Arunabha; Wang, Xufei
- Year
- 2009
- Source paper
- A Social Identity Approach to Identify Familiar Strangers in a Social Network
- DOI / arXiv
- 10.57702/e7fryv45
- License
- Academic Use (see Syracuse Data Lab terms) (LicenseRef-Research-Only)
- Records
- 88,784
- Nodes
- 88,784
- Edges
- 2,093,195
- Nodes are
- blogger
- Edges are
- friendship
- Attributes
- nodes have no attributes; edges have no attributes
- Languages
- en
- Collected
- July 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, 45.4 MB across 3 files. Checksums in MANIFEST.json.
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{agarwal2009social,
title = {{A Social Identity Approach to Identify Familiar Strangers in a Social Network}},
author = {Agarwal, Nitin and Liu, Huan and Murthy, Sudheendra and Sen, Arunabha and Wang, Xufei},
booktitle = {Proceedings of the 3rd International AAAI Conference on Weblogs and Social Media (ICWSM'09)},
pages = {2--9},
year = {2009}
} APA
Switzer, B., & Zafarani, R. (2026). ECHO: Exploratory Compendium of Humanity Online [Data repository]. Syracuse University. https://echo.directory
Agarwal, N., Liu, H., Murthy, S., Sen, A., & Wang, X. (2009). BlogCatalog Friendship Network [Data set]. https://doi.org/10.57702/e7fryv45
MLA
Switzer, Braden, and Reza Zafarani. ECHO: Exploratory Compendium of Humanity Online. Syracuse University, 2026, echo.directory.
Agarwal, Nitin, et al. BlogCatalog Friendship Network. 2009, doi.org/10.57702/e7fryv45.