I have heard of contest about subscribing to a feed and is currently considering to promote my blog using this contest. My problem is that I don't who are the one who has sign up for my feeds. How can I know if that particular person have sign up at all?
The subscriber of your feeds should be displayed under manage, users (if you have turned on the that whoever registers, registers as a subscriber) Also, you can see the daily reach to see the email addresses under feedburner pro.