Private blog posts
A user asked for the ability to choose which contacts a blog post is shared with. For example, some posts might only be shared with family members.
The UX for this might involve showing a visibility option when writing a post, and showing some kind of private post indicator in place of the reblog button for private posts.
This would require changes to the sync API, as currently a message can be shared with all contacts in a group or none, but not with a subset. However the wire protocol would be unaffected.