I am noticing that when somebody in my network retweets somebody who is not in my network from the Twitter home page, I see:
- the retweet,
- a message telling me "Wondering who this is? Someone you follow thought this was worth retweeting, which is why you are seeing it in your Home timeline."
If Twitter gave me the option to follow the person I am not following, or unfollow the person I am following, I would absolutely love this feature.