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README.md

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-# 2ch.sc ()
-
-## Processing
-
-## Licence
-
-...Hard to say. I think this is the first if ever 2ch.sc dataset on HF.co.
-
-The original license allows for the following (translated from Japanese)
-
-
-**"Print Out / Copy / Free Distribution" OK Mark**
-*   A mark indicating permission for "printing out," "copying," and "free distribution" **only**.
-*   This permission is limited to using the work **as is**. It does not include:
-    *   Changing, altering, processing, cutting, partial use, summarizing, translating, transforming, or adapting the work.
-*   Use for commercial purposes is permitted as long as the distribution is free. (For example, you can copy it for distribution in a company pamphlet if the pamphlet is given away for free).
-
-**"Non-profit Use for People with Disabilities" OK Mark**
-*   A mark indicating permission for all forms of non-profit use, such as copying, transmitting, and distributing, **only when the purpose is for use by people with disabilities**.
-*   This permission **includes** activities such as changing, altering, processing, cutting, partial use, summarizing, translating, transforming, or adapting the work.
-
-**"Non-profit Use for School Education" OK Mark**
-*   A mark indicating permission for all forms of non-profit use, such as copying, transmitting, and distributing, **only when the purpose is for use in various school activities**.
-*   This permission **includes** activities such as changing, altering, processing, cutting, partial use, summarizing, translating, transforming, or adapting the work.
-
-
-## お詫び (Apology)
-
-> *負荷が掛かるので、事前相談の無いクローリングも禁止です。*
-> *Crawling without prior consultation is also prohibited as it places a load on the system.*
-
-Although we have not consulted, we have applied the following crawling limits:
-
-1. Concurrently, a maximum of 128 connections can be reading from the server.
-   - While this might sound a lot, in practice the connection maxes out at 100Mbps
+---
+language:
+- ja
+pretty_name: 2ch.sc
+---
+
+# **2ch.sc Corpus**
+### A Large-Scale Japanese Anonymous Web Forum Dataset
+
+This dataset is a large-scale corpus of user-generated text scraped from `2ch.sc`, a massive and influential anonymous Japanese textboard. As a major successor to the original 2channel (`2ch.net`), it represents a significant, unfiltered snapshot of Japanese internet culture, dialogue, and public opinion spanning decades. The data consists of billions of posts across thousands of topic-specific boards, offering an unparalleled resource for studying informal language, online subcultures, and social trends.
+
+## Dataset Structure
+
+The corpus is organized into compressed JSON Lines files (`.jsonl.zst`), where each file represents a single forum board.
+
+**File Naming Convention:**
+The filenames follow the pattern `newdump-{region}_{board_name}.jsonl.zst`.
+*   **`region`**: Corresponds to the server or subdomain (e.g., `ikura`).
+*   **`board_name`**: The name of the specific board (e.g., `anime2`).
+
+Each line within a file is a JSON object representing a single thread.
+
+### Data Fields
+
+| Field | Type | Description |
+| :--- | :--- | :--- |
+| `id` | Integer | The unique identifier for the thread (timestamp-based). |
+| `title` | String | The title of the thread. |
+| `region` | String | The server/subdomain where the thread originated. |
+| `city` | String | The name of the board. |
+| `replies` | Integer | The total number of replies in the thread. |
+| `messages` | Array[Object] | An array containing all posts within the thread. |
+
+### Message Object Structure
+
+Each object in the `messages` array contains the following fields for an individual post:
+
+| Field | Type | Description |
+| :--- | :--- | :--- |
+| `name` | String | The username of the poster, often including tripcodes or other identifiers. |
+| `mail` | String | The content of the "mail" field, often used for names such as `sage`. |
+| `dateid` | String | Timestamp and user ID string (e.g., `2016/05/19(木) 00:03:16.25 ID:uDE3xZkb0.net`). |
+| `body` | String | The raw HTML content of the post. |
+| `title` | String / Null | The title of the post, typically only present for the first post in a thread. |
+
+<details>
+<summary><strong>Click to view a sample JSON object for a single thread</strong></summary>
+
+```json
+{
+    "id": 1463583796,
+    "title": "ガールズ＆パンツァー GIRLS und PANZER 1591輌目",
+    "region": "ikura",
+    "city": "anime2",
+    "replies": 1005,
+    "messages": [
+        {
+            "name": "名無しさん＠お腹いっぱい。＠＼(^o^)／</b>(ﾜｯﾁｮｲ f8f1-xKv1)<b>",
+            "mail": "hageteon",
+            "dateid": "2016/05/19(木) 00:03:16.25 ID:uDE3xZkb0.net",
+            "body": " !extend:on:vvvvv:1000:512 <br> ↑冒頭にコレを二行重ねてスレ立てしておく <br> <br> 戦車道は大和撫子のたしなみ！戦車（パンツァー）のある学園生活、はじ��ました。 <br> ===========================重要=========================================== <br> ・【※実況厳禁】→アニメ特撮実況板：ttp://hayabusa.2ch.net/liveanime/ <br> ・公式以外の動画サイト、ファイル共有に関する話題・URL貼りは厳禁 <br> ・sage進行推奨／煽り、荒らしは徹底放置／2chブラウザの導入推奨 <br> ・次スレは<a href=\"../test/read.cgi/anime2/1463583796/900\" rel=\"noopener noreferrer\" target=\"_blank\">&gt;&gt;900</a>が宣言してから立てる事。無反応なら<a href=\"../test/read.cgi/anime2/1463583796/930\" rel=\"noopener noreferrer\" target=\"_blank\">&gt;&gt;930</a>以降でスレ立て宣言順に立てる事 <br> ・次スレはwikiからコピペして立てて下さい <br> ・巡礼報告はプライバシーに十分配慮し、投稿前に内容を再確認。ガルパンファンとしてマナーを守りましょう <br> ========================================================================== <br> ●放送／配信情報　平成24年10月8日より　12話放送済 <br> TVシリーズ配信　ttp://girls-und-panzer.jp/mv_distribution.html <br> ●前スレ <br> ガールズ＆パンツァー GIRLS und PANZER 1590輌目 <br> ttp://hanabi.2ch.net/test/read.cgi/anime2/1463498901/ <hr>VIPQ2_EXTDAT: default:vvvvv:1000:512:----: EXT was configured ",
+            "title": "ガールズ＆パンツァー GIRLS und PANZER 1591輌目"
+        },
+        {
+            "name": "名無しさん＠お腹いっぱい。＠＼(^o^)／ </b>(ﾜﾝﾐﾝｸﾞｸ MMd0-MTTD)<b>",
+            "mail": "sage",
+            "dateid": "2016/05/19(木) 00:10:40.89 ID:QtmQIsphM.net",
+            "body": " <a href=\"../test/read.cgi/anime2/1463583796/1\" rel=\"noopener noreferrer\" target=\"_blank\">&gt;&gt;1</a> <br> ｱﾘｶﾞﾀｳ、ｱﾘｶﾞﾀｳ ",
+            "title": null
+        }
+    ]
+}
+```
+</details>
+
+## Data Curation and Processing
+
+This dataset is a direct conversion from the native 2ch/5ch `.dat` format to JSON Lines. The raw data was compressed with Zstandard due to its large size (approximately **1.8 TB** uncompressed).
+
+The scraping code used for collection is provided in `KakoIndex.py`.
+
+## Language
+
+*   **Primary Language:** Japanese (ja-JP)
+*   **Characteristics:** The language is highly informal and specific to the platform's culture, containing extensive internet slang, neologisms, and non-standard linguistic phenomena.
+
+## Licensing Information
+
+The licensing for this dataset is complex and not clearly defined for academic or research use. The terms of use from the original source material are translated below.
+
+The author's interpretation is that the license is functionally similar to **CC-BY-NC-ND** (Attribution-NonCommercial-NoDerivatives).
+
+*   **1. "Print Out / Copy / Free Distribution" OK Mark**
+    *   **Permitted:** Printing, copying, and free distribution of the work *as is*.
+    *   **Commercial Use:** Permitted only if the distribution is free (e.g., in a free company pamphlet).
+    *   **NOT Permitted:** Any modification, including changing, altering, processing, cutting, partial use, summarizing, translating, transforming, or adapting the work.
+
+*   **2. "Non-profit Use for People with Disabilities" OK Mark**
+    *   **Permitted:** All forms of non-profit use (copying, transmitting, distributing) intended for people with disabilities. This includes modifications and adaptations.
+
+*   **3. "Non-profit Use for School Education" OK Mark**
+    *   **Permitted:** All forms of non-profit use (copying, transmitting, distributing) for school activities. This includes modifications and adaptations.
+
+> **Disclaimer:** Researchers should consult the original terms on 2ch.sc and use this data at their own risk, considering the legal and ethical implications.
+
+## Potential Use Cases
+
+*   **Large Language Model Training:** Training or fine-tuning models on informal, conversational Japanese.
+*   **Sociolinguistics:** Studying the evolution of slang, memes, and online discourse.
+*   **Sentiment Analysis:** Gauging public opinion on various topics (with awareness of significant demographic bias).
+*   **Toxicity and Hate Speech Detection:** Developing models to identify harmful content in Japanese.
+*   **Cultural Analytics:** Tracking and analyzing social trends and subcultural dynamics.
+
+## ⚠️ Ethical Considerations and Limitations
+
+This dataset must be handled with extreme care due to its unfiltered and anonymous nature.
+
+*   **Hate Speech and Offensive Content:** The corpus contains a high volume of explicit, offensive, and discriminatory content.
+*   **Misinformation and Disinformation:** The platform is a significant source of rumors, conspiracy theories, and deliberate misinformation.
+*   **Toxicity and Pervasive Bias:** The data reflects strong biases (e.g., misogynistic, xenophobic, political). Models trained on this data will inherit and likely amplify these biases if not carefully mitigated.
+*   **Lack of Representativeness:** The user base is a self-selecting demographic and is **not representative** of the general Japanese population.
+*   **Privacy Risks:** Although pseudonymous, posts may contain personally identifiable information (PII) through doxxing or self-disclosure. Rigorous PII scrubbing is recommended.
+
+## A Note on the Crawling Process & お詫び (Apology)
+
+The original site prohibits crawling without prior consultation. The following note is from the website:
+
+> *負荷が掛かるので、事前相談の無いクローリングも禁止です。*
+>
+> *Crawling without prior consultation is also prohibited as it places a load on the system.*
+
+Although prior consultation was not performed, the crawl was limited to a maximum of 128 concurrent connections, which in practice saturated the connection at approximately 100Mbps to minimize server load.