Galaxy Nexus LED notification light

Just got a Verizon GN and had read about Light Flow to control/tweak the LED notification settings. Seems cool, but not exactly what I would like.

To anyone who might know the answer: Does the Galaxy Nexus use the LED for notifications by default, or do I have to use an app like Light Flow to get it to function?

I ask this because I have yet to see the LED light up for any reason. Does ICS use it? I've had SMS messages, Google Talk notifications, facebook notifications, Gmail notifications, etc. None of them seem to cause the LEDs to light up... unless of course I set up some customized tweaks using Light Flow.

If you have any insight, please let me know. Thanks!