What are your thoughts on censorship on social media?

I'm starting to see a trend on most media sites, censoring and deleting comments. I have a been a victim of this trend, most of my comments are either deleted or the site block me altogether.
Years ago there existed a thing called "The Fourth Estate". This was a way to keep people informed and hold those in power to account. News was presented in a non-political way.
Alas as economic playing field of the world was slowing being corrupted by laws that protected companies from democracy, having hard hitting stories around this bias and corruption could no longer be tolerated and so the world's elite started buying up media outlets so they could put their own spin on news and so keep people in ignorance.