If you're keeping score at home, Facebook now has Stories-style features on Facebook (still in beta) Instagram, Whatsapp and now Messenger. So what makes the new app unique? Facebook says that rather than recounting what you did already, the new app is for having "more meaningful conversations" that let you show your friends what you're up to now. While all the versions are confusing (why doesn't Facebook just have one for all four apps?), the company perhaps felt it couldn't neglect Messenger, since it does have over a billion users.

Eventually the social network is likely to put ads in between posts in order to generate revenue for the app, Facebook VP David Marcus told Techcrunch. After tests in Poland and Australia attracted millions of users, the feature is going live for everyone on Android and iOS, so you should see it pop up soon.