Stack Exchange — ja.stackoverflow.com
Stack ExchangeAcademicEngagementKnowledge sharingQ&ASocial graphSoftware development A Stack Exchange (ja.stackoverflow.com) dataset of 11,176 users, 23,490 answer-collaboration edges, 31,119 questions, 36,454 answers, collected by Stack Exchange, Inc. via the annual Stack Exchange Data Dump. Each record contains user nodes (reputation, badge counts, vote history), directed weighted edges (answerer→asker, weight=answer score, count=interactions, accepted=bool), post text, tag distribution. User collaboration network from ja.stackoverflow.com — directed weighted graph where edges represent knowledge-sharing relationships (A answered B's question), with edge weight reflecting answer quality. Enables prestige hierarchy, community detection, and expertise flow analysis.. Suitable for expertise network analysis, reputation systems, community detection, knowledge flow, PageRank-based authority ranking, Q&A platform dynamics..
Cite this dataset at
stackexchange-ja-stackoverflow-com.echo.directory
Analytics
The full graph has 11,176 nodes; this view shows the 1,000-node sample the pipeline drew for display. Node size is centrality, colour is community.
Topic 0
Topic 1
Topic 2
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Topic 11
Show all 30 topics
Topic 12
Topic 13
Topic 14
Topic 15
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Topic 20
Topic 21
Topic 22
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Topic 25
Topic 26
Topic 27
Topic 28
Topic 29
Sampled: text metrics from 50K of 176K records; topic model from 20K.
Record
- Catalog key
stackexchange-ja-stackoverflow-com- Authors
- Stack Exchange, Inc.
- Year
- 2025
- Source paper
- Stack Exchange Data Dump
- License
- CC BY-SA 2.5 / 3.0 / 4.0 (by post date) (CC-BY-SA-2.5 AND CC-BY-SA-3.0 AND CC-BY-SA-4.0)
- Records
- 176,024
- Nodes
- 11,176
- Edges
- 23,490 (directed)
- Nodes are
- user (Stack Exchange account)
- Edges are
- answer collaboration (A answered B's question)
- Attributes
- nodes have attributes; edges have attributes
- Text corpus
- question titles, post bodies, comment text, tag names
- Languages
- ja
- Collected
- 2014/2024 (2010s, 2020s)
- Tasks
- From the graph: link prediction, community detection
- Region
- East Asia (inferred: from the language of the data)
Provenance
- Originally published at
- https://archive.org/download/stackexchange link checked
- Hosted copy
- Mirrored on echo.directory on 2026-10-09, 77.0 MB across 1 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}
}
@misc{stackexchange_2025,
title = {Stack Exchange Data Dump},
author = {{Stack Exchange, Inc.}},
year = {2025},
publisher = {Internet Archive},
url = {https://archive.org/download/stackexchange}
} APA
Switzer, B., & Zafarani, R. (2026). ECHO: Exploratory Compendium of Humanity Online [Data repository]. Syracuse University. https://echo.directory
Stack Exchange, Inc. (2025). Stack Exchange — ja.stackoverflow.com [Data set]. https://stackexchange-ja-stackoverflow-com.echo.directory/
MLA
Switzer, Braden, and Reza Zafarani. ECHO: Exploratory Compendium of Humanity Online. Syracuse University, 2026, echo.directory.
Stack Exchange, Inc. Stack Exchange — ja.stackoverflow.com. 2025, stackexchange-ja-stackoverflow-com.echo.directory/.