| 15 January 2016 (2016-01-15)|
#1Lib1Ref ("One Librarian, One Reference") was a Wikipedia publicity drive that asked each librarian on Earth to mark the 15th anniversary of the foundation of Wikipedia, on 15 January 2016, by adding a citation to the online encyclopedia.
The organisers estimated that if each librarian on the planet spent 15 minutes adding a citation, then the English Wikipedia's backlog of 350,000  templates would be cleared.
The week long event, which ran from 15-23 January, used the hashtag "#1lib1ref".
As of the end of the campaign, 1,232 revisions on 879 pages, by 327 users in 9 languages used the hashtag #1lib1ref in the edit summary with the total edit count estimated to be around 50% below the actual number. Furthermore the hashtag was used in 1100 Twitter posts by over 630 users.