The idea is identical in Facebook Stories, where users will now be able to post a photo or video through a new UI at the top of the Facebook mobile app. Their friends can see the post over the next 24 hours and reply to it within Facebook Messenger. Continuing the trend, last week that app launched "Messenger Day" for users to create the exact same disappearing posts, but centered on creating plans with friends. Facebook originally tested out Facebook Stories in Ireland.
[Update 3/16]: Facebook has contacted MacRumors with a correction, stating that some misinformation has been floating around online and the company is "not rolling this out globally yet." The company mentioned that it is "still testing it in a few countries -- most recently, Chile, Vietnam and Greece as of yesterday," but it has "no global rollout plans or timeline to share quite yet."