The writing was on the wall a decade ago when everyone and their cat was posting junk content. Zuck's original idea was outstanding. He slowly cannibalized the massive success into outright gross platform:

Get to know girls at Harvard!

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Get to know girls at select universities!

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Get to know anyone we've invited! We're so popular, we've got profiles of people at every major university! Write them messages, organize parties, etc! Upload pictures of parties or anything interesting!

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And now you can play addicting games on Facebook!

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And you can make a profile if you don't have a school!

And be fed ads and clickbait!

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while we quietly dump-sell all your info to anyone!

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Now meet 20% more criminals and scammers! Sell your car on our marketplace! You'll regret every message!

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Now with international crime!

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Now with more bots than humans!

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Why is everyone not respecting us? Oh, its over!