Journalism and its Role as The Fourth Estate

With all the changes occurring in ‘traditional journalism’ during the digital era, is it being challenged to the point of losing its synonym as the “fourth estate? Is this concept shifting in practice and what we call journalism at least the fifth estate? What should we know when drawing a parallel between journalism and Public Relations (PR) and what’s the importance of Media and Information Literacy (MIL) in building an environment with readers who are able to critically access, analyze and evaluate information?