I'm just curious what determines the efficiency of receiving notifications? I have set up notifications for 2 email accounts, my facebook, and several apps, but I only get notifications for new messages SOME of the time. In fact, I believe most of the time I do not get notified at all, and for some reason last night I was notified AND it played my notification sound. Second time that has happened. Is there a way to improve the efficiency of this feature? Is this Androids answer to iOS "push"?