Right or left, you should be worried about big tech censorship
Also what about laws and governments ? 
This is a very american  perspective IMHO to miss this part of the picture.Some stuff should be regulated. Especially post of FB/Twitter/ect that are actually provably false and whose diffusion are nothing but a carefully crafted op from a foreign country.you could be concerned about over-regulation, but currently we are at the opposite side of the spectrum.Asking FB/Twitter - or any company - to do the right thing and go against its own interest is simply naive.