I was ussing Facbook connect in my iPhone app, but in december the posts stopped working. After some research I found that i'm supossed to use stream.publish, something like:

NSString *att = @"{\"bob\":\"i\'m happy\",\"caption\": \"User rated the internet 5 stars\", \"description\": \"a giant cat\"}";
    NSDictionary *attachment = [NSDictionary dictionaryWithObject:att forKey:@"attachment"];
    [[FBRequest requestWithDelegate:self] call:@"facebook.stream.publish" params:attachment];

Which i think it's correct, but the posts still don't work. Someone told me that i need to get publish_stream extended permission from the user, but i dont know how to do that.