The development was revealed to in October 2017. The feature, highly requested by Japanese users, started from an annual hack week at the company[71] and called "#ShareForLater".[72] Previously, users would resort to liking the tweet or by sending it to themselves.[73][74] Liking tweets is often seen as an endorsement or positive endorsement, and the likes are public and are notified to the user who made the tweet.[72][70] The feature was tested in November for some users,[75][76] and rolled out in February 2018 on mobile alongside a new share menu.[77][78] The web version of Twitter did not test the bookmark feature until November 2018[79] When released, the user who made the tweet would have been unaware that a tweet was bookmarked.[80]