Wikipedia — the world’s largest online encyclopedia — celebrated its 20th anniversary this year. One of the biggest collaborative efforts in human history, thousands of volunteers around the world create and edit the content on its pages.

And those editors even have camps with competing philosophies: the deletionists who have high standards for content versus the inclusionists who take a broader view to what makes it in.

But all is not well in the Wikipedia world.

A new study by American sociologist Francesca Tripodi shows that its volunteer editors nominate women’s pages on Wikipedia for deletion at a higher rate than men’s pages.

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