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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Elapsed time: 2 s

Results

4 results found.
  1. 利用者‐会話:甘薄荷
  2. Wikipedia:チェックユーザー依頼/だぶるすてっち他
  3. Wikipedia‐ノート:コメント依頼/だぶるすてっちとJapaneseA 20161114
  4. Wikipedia‐ノート:メインページ新着投票所/新しい項目候補