As an example of bias, I've recently seen on Facebook a post that instructed the readers to shoot law enforcement people in the face. Not exaggerating, those are the exact words, "shoot him in the face". Facebook told me this is well within the "community standards". Yet for example Zuckerberg personally promised to ban any page that promotes protests against COVID lockdown. So, calling for protesting lockdown - ban, calling for murdering the police - OK. Sounds like a bias.