You don't need to be promoted.
Instead, I think we, as a whole, if we want to gain followers, should post better things.
I really don’t think theres any point if you follow/reblog/like someone on tumblr just to get promoted. I mean, if you don’t really like their stuff and they don’t like yours, its just like bribing.
Honestly, people who follow one by one because your blog is good are the only true “followers”, and those who follow just to get promoted are really really bleh.