As incomprehensible as this may appear to some people, there are facts and it's also very easy to get down to them and discern real news from false news and its way worse cousin fake news. If some alleged news does not withstand repeated scrutinity from various different news organizations, including professional ones, and if it is not taken up by many different sources including professional ones, then it's most likely false news and might also be fake news. (The latter is even easier to spot for anyone but the mentally deranged, but see the comment below.) As for "fringe content", that is reported by news agencies every day, if you're interested in local traffic accidents, curious or funny anecdotes, etc. you should get a subscriptions to AP, Reuters, etc.
If some news is repeated by many different newspapers and TV channels, that's a good sign, because there is only one reality.
The people who think there are multiple realities are confused, they confuse opinions and editorial comments with facts and have chosen bad and unreliable sources (news aggregator sites, for instance). In my experience a principle from sound engineering describes very well what's going on when people start to get confused, babble about social constructivism or 'alternative facts': Garbage in, garbage out. If you get your 'news' primarily from Facebook, that's too bad for you.