A public work or in publicity

 Blog texts etc are public in the sense that they are in the internet, one has intended them for readers whom one does not know, so they are public works but not wide-sporead, not in publicity, not in the media like news for example. One comes to a blog post via an internet search or via a link in a subject to which the text is connected. So that is somewhat like a hobby or an area that one is interested in. It is very different from the news which introduce subjects to very wide audiences that have not chosen those subjects themselves.