Let's be clear about who.
Who is arguing that people need separate identities for work, family, and friends? Sociologists
Who is arguing that having a single identity will make society more open? Mark Zuckerberg.
Source: https://boingboing.net/2018/01/22/facebook-is-sad.html
As a young man I had a few friends and acquaintances who intimated that they had been stalked. My ex wife shared a story of being stalked by a deputy sheriff. And I can’t recall now but she may have been underage at the time to boot.
Pretty quickly I saw a pattern. People who don’t want privacy have never cared about someone who really needed it. Or needed it themselves.
If you think you might be queer, molested, or your neighbor might be in a hate group but you’re not sure, if you think your kid is doing drugs, you can’t just voice these opinions without putting someone in literal mortal peril. And there are a host of other things that might get you stigmatized. If you are in a bizg city that’s not a big deal. Find new people. But if you’re in a small town...
In a bid to capture all aspects of your “true” identity (that too, for marketing purposes) Facebook is trying to force legibility [1] on something it fundamentally doesn’t understand. If it succeeds, then we might have the largest disaster caused by a bureaucracy, the kind one has learned to expect from reckless government planning [1,2].
[1] https://www.ribbonfarm.com/2010/07/26/a-big-little-idea-call...
[2] https://www.goodreads.com/book/show/20186.Seeing_Like_a_Stat...
Really? This hasn't been my experience at all. FB can be just as toxic as e.g. a youtube comment section, and what I see more often than not is people self selecting based on who agrees with them nearly 100% of the time.