I have this code that can\'t send a Facebook request until now.
NSDictionary *firstDict = [NSDictionary dictionaryWithObjectsAndKeys:
@\"image\", @\"Type\",
I modified your example a little and it works. Here's the working code:
NSString *att = @"{\"name\":\"i\'m bursting with joy\",\"caption\": \"User rated the lolcat 5 stars\", \"description\": \"a funny looking cat\"}";
NSDictionary *attachment = [NSDictionary dictionaryWithObject:att forKey:@"attachment"];
[[FBRequest requestWithDelegate:self] call:@"facebook.stream.publish" params:attachment];