Damn look at screenshot F.A.Q: Q: How does it work? A: Go to m.facebook.com, then go to chat of your friend, if they're offline you'll see last time in total days/hours/minutes/seconds. -- Q: Hey, it doesn't work on Desktop version, wth? A: it's for m.facebook.com -- Q: Hey, it isn't refreshing A: Why the hell you want me to crash your browser by implementing it? -- Q: Why does it print it in dev-tools@console? A: Bcaus it can?