Lions for Lambs and The Use of the Mass Media

One of my questions were: Should we question ourselves on what we hear and be critical, or listen and believe in everything we hear in the mass media?

We should trust them, we should not trust them. The reason I mention both options is obvious. There are hundreds of news channels, thousands of newspapers and millions of web pages all over the world, which one of them are most trustworthy? Are some more trustworthy than others at all? Do we have to be critical on what we hear? Do we need to question the facts we are given every afternoon