I’ve got good news and bad news for Tech Backlashistas™ who are wishing Facebook would just die and get replaced by something else.
Good news: you’ll probably get your wish within 10 years
Bad news: the replacement will probably be something involving a blockchain 
The blockchain is a way to create scarce authentication in the absence of trusted central authorities. It is much more expensive than proofing a central authority, and the communication infrastructure itself requires such authorities anyway.
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Please expand on this if you have time. What is the cost of proofing? What happens if a central authority doesn’t pass the test? Maybe some form of blockchain could create shared belief and shared knowledge in ways vastly more powerful / valuable / useful than centralized.
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The problem is that you ALREADY need to trust at least one authority, such as your ISP, your CA and your government (that could outlaw the protocol your need to synch the blockchain tomorrow). Once you accept a central authority, authentication via blockchain becomes obsolete.
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