Tomorrow, October 9, Facebook is launching a set of icons as an extension of the "Like" button. Called "Reactions", these icons will allow you to show support more effectively... I mean, "liking" a post when a friend's dog dies? That's so sad. And now, we can click the "Sad" button to show support. These reaction icons will first be available to users in Ireland and Spain - when they will be launched worldwide has not yet been determined.