Journalist can not rely on algorithms alone to break the "filter bubble". Take a look at 7 traits that makes humans superior to machines. Journalist as curators of news, offer a distinct advantage over machine algorithms.
I suggest that algorithms will never replace a human editor. Algorithms is a procedure for solving problems. A curator is a human operator that adds a set of parameters machines can never replace, at least not for the foreseeable future. This post provides the answers.