WriterBabu gives you an option to write anonymously. Your post will be visible to everyone but your name will not be there on the post. There is no way that one can figure out who has written an anonymous post.
When the author reply back on the remark given in the author poll, even then the identity is not disclosed. However, author has option to reveal his/her identity to the other person in conversation through clicking on a button "reveal identity". This will reveal author's identity only to the person in conversation and not other readers.
Once change the post from anonymous to public or for friends anytime by editing the post. Same is applicable for converting a post from public or friends to anonymous.