Facebook is reportedly rolling the new update feature that allows users to store your friends' posts to be read later time. Features 'save it later' is actually similar to the features present in Instapaper. Users who already have this update will get a notice from Facebook.
For starters, Facebook is rolling the new features for mobile users. But in some other users also reportedly been able to enjoy these features through the desktop version. Button 'save' will appear on every update, and if clicked on the article will be 'saved' in a subfolder favorites.
origin source imore, The Verge