Giving tyrants, idiots and other malignants unnecessary and undesirable reach and amplification, or feeding them pernicious lies and half-truths. These companies rule the Western world. Not governments.
Sacha Baron Cohen gave a speech on this. And he is correct:
Ironically, it is posted on YouTube, of course.
You can also read it in the Guardian: https://www.theguardian.com/technology/2019/nov/22/sacha-baron-cohen-facebook-propaganda