#1Lib1Ref (known in some Romance languages as #1Bib1Ref) is a Wikipedia campaign inviting librarians to participate in the online encyclopedia project, specifically improving articles by adding citations.
The first #1Lib1Ref campaign coincided with the 15th anniversary of the founding of Wikipedia in January 2016. Based on the premise of One Librarian, One Reference, organizers estimated that if each librarian on the planet spent 15 minutes adding a citation, the combined effort would eliminate English Wikipedia's backlog of 350,000 "[[[Category:All articles with unsourced statements]]]" notices. The inaugural, weeklong event ran from 15–23 January 2016, and employed the hashtag #1lib1ref on various social media platforms.
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Text from the Wikipedia article “#1Lib1Ref”, available under CC BY-SA 4.0.