That's putting yourself in a bubble.
This is contingent on firstly exclusively liking journalists you agree with, and secondly different major (us) news sites more than superficially disagreeing with one another. The fact that you are concerned with a bubble points to the fact that you want to read jounalists you disagree with and so can select these individuals to aggregate from. All major (US) news sources disagree only on the matter of implementation of liberalism (in the actual sense) with regards to social policy.