You have made really good points here...

One of the reasons why i think it will be almost impossible for contents that run on a decentralized blockchain to be taken down, even though technically it can be taken down, is that a blockchain that has thousands or millions of nodes in different countries and different parts of the world, would be impossible for a coordination to be in place to be pressured by authorities to shut down their operations. Because, the authorities would have to coordinate all the running nodes before it can even be possible. In some mechanisms, Even if the top nodes in major countries are pressured to shut down, the blockchain would still run because the nodes below the ranking would take over those shutdown positions. Nonetheless, the concept of decentralization is still in its early years and still has a long way to go to completely replace centralization when it comes to social media.

Thanks for your input