User blog comment:V3hemenc3/What is the accepted number of farm on an AD carry?/@comment-91.120.13.74-20120919075425/@comment-217.121.187.123-20120920080024

That's wrong. AD carries should pay attention to only one thing, and that is farming. The support should pay attention to enemy junglers about to gank, that Blitzcrank waiting in the bush (just ward), an opportunity to cc the enemy AD carry, etc.