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iOS

Facebook Class or Facebook Singleton

i was reading about Singleton's in iOS and was wondering which is better a separate class which shares the info with other classes or a singleton, because i have just finished doing a separate Facebook Class and tried to share the user's info like user.name user.id (name, pic) with other classes and i'm not able to i need some help or a tutorial on sharing info, well i have done with the profileViewController but thats the only view i can share the info with i'm not able to put the name or the pic in the slide menu or the settingViewController i have been looking around for some help but cant find i'm just stuck on the issue. I want to have a separate class that gets called from the AppDelegate once the app is loaded so its only called once and everything is set i mean i login and then the name and pic get sent to profile but no where else so please some help