Thread:Tupka217/@comment-35141726-20190105150640/@comment-1038387-20190203144855

Actually, *who is. Both who and whom are wrong. If you're referring to things that have already happened, even who is adding is wrong - it should be Who has added. And a question mark at the end.

Somebody else did it. I don't know who; probably someone who did extensive work on the article. You can dive into the page's history if you want.