Get Facebook access token from Social.framework(iOS6)

If you already know how to get the account store set up, here's code around it showing how to get the access token:

@property (strong, nonatomic) ACAccountStore *accountStore;@property (strong, nonatomic) ACAccount *fbAccount;...@synthesize accountStore = _accountStore;@synthesize fbAccount = _fbAccount;...// Initialize the account storeself.accountStore = [[ACAccountStore alloc] init];// Get the Facebook account type for the access requestACAccountType *fbAccountType = [self.accountStore    accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];// Request access to the Facebook account with the access info[self.accountStore requestAccessToAccountsWithType:fbAccountType                                           options:fbInfo                                        completion:^(BOOL granted, NSError *error) {    if (granted) {        // If access granted, then get the Facebook account info        NSArray *accounts = [self.accountStore                             accountsWithAccountType:fbAccountType];        self.fbAccount = [accounts lastObject];        // Get the access token, could be used in other scenarios        ACAccountCredential *fbCredential = [self.fbAccount credential];                    NSString *accessToken = [fbCredential oauthToken];        NSLog(@"Facebook Access Token: %@", accessToken);        // Add code here to make an API request using the SLRequest class    } else {        NSLog(@"Access not granted");    }}];