4chan /hr/. I don't know original source (well, duh, it's official KD since I saw this illustration in one of the official wallpapers) since the OP didn't specify last time I checked... a couple weeks ago? I can send it to you (4000x5000, haha) if you want.
Program's called DesktopEarth and the lit-up area automatically shifts every minute (or 5 minutes, or every hour, however you set it)... So while it's not a LIVE shot, it's FAKED similarly...