Tumblr is a blog platform that adds a bit of a social networking element to blog subscriptions. Instead of subscribing to an RSS feed like you might with other blog platforms, you instead can "Follow" other Tumblr users and have their posts appear on your Tumblr Dashboard page. If you run a Tumblr blog and would like to see who is following you, you can do so quickly.
Visit Tumblr.com and sign in to your account.
Click on the title of your Tumblr blog at the top of the screen.
Click the "Followers" button located on the right side of the screen between "Posts" and "Messages." This displays all the Tumblr users who are following your blog.