I see so many replies here but no one is thinking on below lines.
When Facebook is centralized, we can see so many people abusing it so why do we need a decentralized version? People post death threats, abuses, spread false curfue rumors and some users have posted their suicide video on Facebook. They couldn't manage controlling these issues so I can just imagine what will happen when people have freedom of speech. Just because some famous people were banned, it doesn't sound logical and it's not even possible to have a decentralized social media website. Government will be first to ban it.
We need impartial media, not the decentralized one. Democracy/decentralization is dangerous thing if the "hands" participating in it overpower the "heads" that are supposed to make good decision.