In you’re face-book!
Early 2012, Mark Zuckerburg shifted the company initiatives to being a “mobile first”, from its instant messaging to the news feeds. So naturally from this shift we were going to see new app’s regarding facebook, and we have one, and it’s called Chat heads. This app lets you chat to you’re friends on facebook, from the phone’s lock screen and at another time you are using you’re phone. The app runs physically on top of you’re apps, so when you get a message from you’re friend from facebook it will pop up to the side of the phone and display the message. More explained on the Verge: http://www.theverge.com/2013/4/16/4205000/talking-heads-how-a-late-night-hack-turned-into-facebooks-next-big-thing