Change Post Visibility
When creating or editing a post, you have the option to set its status to private. Only you can see a private post; as a result, no one else can reblog it. If you make the post visible again, other Tumblr users can reblog it.
Create Private Blog
While your main blog must remain public, you can create a password-protected secondary blog. The audience of a private blog consists only of people you have approved and given the password. Only they can see or reblog a post you make to a password-protected blog.
Ignore User
Ignoring a user prevents her from seeing any of your posts in her feed. It doesn’t prevent her from reblogging your posts, but it can serve as a deterrent. To see your blog’s content, she must visit your blog by typing your URL into her Web browser.
