What volume setting do the Twitter and Facebook apps obey? I asked a question about silencing only certain sounds and decided to go with the AudioManager widget, which is working quite well. My main uses are to silence everything but alarms and the ringer when I'm sleeping and everything when I'm in class. However, if I get a notification from Facebook or Twitter (both the official apps by Facebook and Twitter, respectively) at night, they still go off, which makes me think that these apps either use the ringer volume (instead of the alert volume) or some volume that AudioManager doesn't have control over.

The volume controls provided by AudioManager are Alarm Volume, Music Volume, Alerts Volume, Ringer Volume, System Volume, and Voice call Volume. Alarm volume is always 7/7, music volume is where ever it was last time I listened to music (in the car, I have it 15/15, and usually 8/15 when I'm listening with earbuds), alerts is 7/7 during the day and 0/7 at night, ringer is always 7/7, system is 7/7 during the day and 0/7 at night, and voice call volume is 3/5.

So, my questions:

(1) What volume do these apps actually use for notifications?

(2) Is there an easy way (without having to open both apps and turn off notifications at night, then turn them back on) to silence these notifications? This includes possibly switching away from AudioManager to another free application.
1) App notifications use the Ringer volume for how loud the notification is played.

2) You could use an application like Locale or Tasker to automatically silence your Ringer volume during the night.  Then you could create exceptions if you need for certain people to be able to call you during the night.