I very much doubt that Facebook or Twitter admit that they have any bias other than being anti-racist, etc. That is breech of contract — people invested a lot of time in building up their accounts. Some spent a lot of money.
[But obviously I’m no lawyer.]
Oh no they will not admit their bias towards the left and against conservatism.
Not a lawyer? But you can play one on the internet plus remember as the dog said while at his computer to his friend
no one knows you are a dog on the internets.