iPhone Facebook SDK - Cannot post to friends wall

I'm attempting to post to a Facebook friend's wall using the Graph API. But instead of posting to my friend's wall it returns all his wall posts. I've attached the code I'm using below and from searching other similar questions it seems like my code is correct.

I've also开发者_高级运维 already set the correct permissions (read_stream & publish_stream). Does anyone have any ideas?

NSMutableDictionary* params = 
    [NSMutableDictionary dictionaryWithObjectsAndKeys:@"some test text",
                                                      @"message",
                                                      @"123456789",
                                                      @"target_id",nil];

[self.facebook requestWithGraphPath:[NSString stringWithFormat:@"%@/feed",@"123456789"] 
                          andParams:params 
                        andDelegate:self];

you try like this ,

[self.facebook requestWithGraphPath:@"123456789/feed" 
                          andParams:params 
                      andHttpMethod:@"POST" 
                        andDelegate:self];

Because it seems, You are not adding method attribute