I hope someone can please help me. Both my iPhone 3GS and iPad 2 have just recently stopped making alert sounds when I get a Facebook notification. I have no idea how to fix it, I've been through the standard settings and checked the volume but nothing seems to fix it. Every other notification is working fine and making the correct alert sounds but I'm getting nothing from the Facebook app. I have tried reinstalling the apps but this did nothing. I have never jailbroken either device either. Thanks.