Best thing is to call out posters for low quality sources like second hand opinion pieces like Washington Post or punditry like AlexJones. Best practice is to use primary sources as much as possible and distinguish fact from pure opinion.
Elon Musk agrees:
Reading the source material is better than reading other people's opinions about the source material https://t.co/HKIYKbdb3g
— Elon Musk (@elonmusk) January 30, 2017