Background is at Facebook, Twitter and peers for sale – privately.
My initial impression is that this could be an ingenious adaptation to an obnoxiously overregulated environment. Or it could be crushed by regulators and their enablers; given that a Republican Congress and President were willing to saddle us with Sarbanes-Oxley seven years ago, it is not easy to imagine our current complement of parasites reacting dispassionately to private stock exchanges.
Note that I do not meet the minimum qualifications (net worth $1M, annual income $200k for past 2 years); this is just to elicit discussion by knowledgeable people (the minimum qualifications for which I also do not meet).