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How can I use Facebook instance in a ViewController?
- (void)viewDidLoad
{
    [super viewDidLoad];
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    Facebook *facebook = [appDelegate facebook];
}

#import <UIKit/UIKit.h>
#import "FBConnect.h"

@interface MyFacebookViewController : UIViewController <FBSessonDelegate, FBRequestDelegate>
@property (nonatomic, strong) Facebook *facebook;
...
@end

#import "MyFacebookViewController.h"
#import "MyAppDelegate.h"

@implementation MyFacebookViewController

@synthesize facebook = _facebook;

-(Facebook *)facebook
{
    if(!_facebook){
        _facebook = [[Facebook alloc] initWithAppId:MY_APP_ID andDelegate:self];
    }
    return _facebook;
}

-(void)viewDidLoad
{
    [super viewDidLoad];
    ((MyAppDelegate *)([[UIApplication sharedApplication] delegate])).facebookViewController = self;
    ...
}

#import <UIKit/UIKit.h>
#import "MyFacebookViewController.h"

@interface MyAppDelegate : UIResponder <UIApplicationDelegate>
...
@property (strong, nonatomic) MyFacebookConnectViewController *facebookViewController;
@end

@implementation MyAppDelegate

@synthesize facebookViewController = _facebookViewController;
...

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    return [self.facebookViewController.facebook handleOpenURL:url];
}

#import <UIKit/UIKit.h>
#import "FBConnect.h"

@interface MyAppDelegate : UIResponder <UIApplicationDelegate>
...
@property (strong, nonatomic) Facebook *facebook;
@end

#import "MyAppDelegate.h"

@implementation MyAppDelegate

@synthesize facebook = _facebook;

-(Facebook *)facebook
{
    if(!_facebook){
        _facebook = [Facebook alloc] initWithAppId:MY_APP_ID andDelegate:self];
    }
    return _facebook;
}

-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    return [self.facebook handleOpenURL:url];
}

#import "MyAppDelegate.h"

@interface AnyViewController : UIViewController
...
@property (strong, nonatomic) Facebook *facebook;
@end

#import "AnyViewController.h"

@implementation AnyViewController

@synthesize facebook = _facebook;

-(Facebook *)facebook
{
    if(!_facebook){
        MyAppDelegate *theAppDelegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];
        _facebook = theAppDelegate.facebook;
    }
    return _facebook;
}