I really shouldn't engage with this, but if you are suggesting that we will eventually have a "decentralized" version of Facebook that's built on something like Ethereum's smart contracts then I think you are placing too much weight on the probability that people care about decentralization.
I'm placing a high probability that the UI/UX for these systems will improve drastically over the next decade, and that a decentralized FB will be more efficient and transparent than the current platform.
