Facebook is giving another feature that clones Snapchat Stories a big push.

Facebook Stories, a feature that puts photos that disappear after 24 hours at the top of the Facebook mobile app, is rolling out to users in Chile, Greece and Vietnam, Facebook confirmed. However, it is not available to users in all markets. The feature was first tested among users in Ireland in January and its extension this week comes hot on the heels of a major Facebook offensive to bake Snapchat’s core features into its main mobile services.

Messenger Day was launched inside the Messenger app last week, targeting the app’s one billion-plus monthly users with a feature that frustrated many by sitting right at the top of the app. Having already introduced similar features in WhatsApp in February and Instagram last year, Facebook is applying its Snapchat cloning to its main mobile app, which accounts for most of the 1.7 billion people who use Facebook on mobile each month.