Change Request: Make Author Option to publish to all or followers only

This should be very self explaining, but a function that take advantage of the followers function of the blockchain should be considered a logical new options for #newsteem moving forward.

Having Subscribers/followers/fans is awesome, and there should be a perk in that regard like premiering content for logged in followers before the rest of the world get access to the post. This could also lead to a functionality making posts private/unlisted.

Play with the idea please.