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That was the annoying part, iPhone eat so much battery specially when you have several apps that are auto sync and notified you in every updates. Even I turn them off, there they always go working in the background. For FB, what usually do is logging off one not using it, same to other tools and apps. Once I turn those on, the battery life just consume 7 to 10 hrs when using and specially I am using bluetooth iphone keyboard during I play certain games.
Oh that's a cinch. Go to your Settings, select Notifications, and then there's GRANULAR controls for your apps which generate notifications. You can select whether you want an annoying Alert (that you have to click on to make it go away), a non-obtrusive Banner at the top of the screen, or None. Also with some apps there are options for using a Badge App Icon that will show up instead of the normal App icon when you have a notification waiting, as well as options for Showing a Preview of the notification, how many times to repeat the alert, and whether or not you wish for the alerts to show up if your phone is locked (what's the purpose of locking your phone if emails and texts can be read by anyone).