How to extract Facebook posts information - ios

Question

I'm using this code to read the last post with location of all my facebook friends:
(FacebookFriend is an object I've created mySelf and contains also the friend's id and _facebookFriends contains all my facebook friends)
_postsWithLocationList = [[NSMutableArray alloc] init];
for (FacebookFriend *currentFriend in _facebookFriends) {
FBRequestConnection *connection = [[FBRequestConnection alloc] init];
NSString *path = [NSString stringWithFormat:#"%#/posts?limit=1&with=location",currentFriend.id];
FBRequest *postsWithLocationRequest = [FBRequest requestWithGraphPath:path parameters:nil HTTPMethod:#"GET"];
[connection addRequest:postsWithLocationRequest completionHandler:^(FBRequestConnection *connection, NSDictionary *result, NSError *error) {
NSDictionary *postData = [result objectForKey:#"data"];
if (postData.count != 0) //some people don't have any post with position
{
// how to extract "place" object?
}
}];
[connection start];
}
and then I would like to store every location in my NSMutable array _postsWithLocationList.
Once I've extracted *postData I printed it's content and it looked like a dictionary (where "place" is a key) exactly as in the Facebook Graph API Explorer.
But when I printed
NSLog(#"%i", postData.count);
I saw that the length of "postData" was always 1, so I think that it's a single object that contains all the instances of the post. I looked at https://developers.facebook.com but I don't understand the type of this object and how to extract it's content.