Levels of Tumblr.

back-to-five:

 

1 follower = Tumblr Newbie.

10-40 followers = Tumblr Beginner.

50-99 followers = Tumblr User

100-349 followers = Blogger

350-500 followers = Dedicated Blogger.

501-799 followers =  Tumblr Expert.

800- 4,999 followers = Tumblr Popular.

5000+ followers =Tumblr famous. 

These are the legit numbers.

(Source: toucher)