iphone - Posting message on my wall facebook ios sdk? -

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hello trying post message on wall while targeting friend. post on our wall @friendsname.i using code below 

 nsmutabledictionary* params1 = [nsmutabledictionary dictionarywithobjectsandkeys:                                     @"post", @"type",                                     urlqrcode, @"picture",                                     [globals linktoapp], @"link",                                     @"xsxsx", @"name",                                     @"sxsxsxsxsx", @"caption",                                     @"sxsxssx", @"description",                                     messsdsage, @"message",                                     @"friendfbuid", @"to",                                     nil];        [appdelegate.facebook requestwithgraphpath:@"me/feed"                                      andparams:params1                                  andhttpmethod:@"post"                                    anddelegate:self]; 

+(shkitem *)image:(uiimage *)image title:(nsstring *)title;   uiimage *image = [uiimage imagenamed:@"sanfran.jpg"]; shkitem *item = [shkitem image:image title:@"look @ picture!"];

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