Intersect Contribs
Wikimedia Tool Labs — Pietrodn's tools.

This tool intersects the contributions of two or more users on a given WMF project, showing the pages edited by all of them.
It can help in discovering sockpuppets.

Update: On 2016-04-05 I updated the tool to support the intersection of the contributions of multiple users. Unfortunately, to handle this in a reasonable way, I had to change the format of the URL parameters. The old URL format ("user1" and "user2") is still supported, but eventually this will be removed.
This means that existing links to the tool referring to a specific couple of users will be broken.
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Results

17 results found.
  1. KISCO
  2. うしじまいい肉
  3. ウィキペディアへの批判
  4. ピン・アップ
  5. 小室哲哉
  6. 建設技術研究所 (企業)
  7. 林忠四郎
  8. 桑山
  9. 渋沢財閥
  10. 田川まゆみ
  11. 鴻池財閥
  12. 利用者‐会話:115.177.127.189
  13. 利用者‐会話:116.80.27.10
  14. 利用者‐会話:121.94.4.251
  15. 利用者‐会話:124.27.134.34
  16. 利用者‐会話:124.27.138.138
  17. 利用者‐会話:124.27.146.217