I have no idea how many fake fakebook accounts there are, and just used the figures you supplied for it.
Do you think there are less than 10 million 'real' fakebook accounts? That would be comparable user retention to Steem's. l am sure we both reckon there are more fakebook users than that - although we have no data we can trust. All sources of data I have seen have shown user retention on Steem to be far lower than FAANG users. Whether any of that data has even remote resemblance to fact I have no expectation of knowing.
None of that actually addresses my point, which is that adding economic incentive to participate in social media is actually an enormous incentive, and despite that incentive Steem is doing worse retaining it's users than platforms without that incentive, and that indicates that management of those Steem platforms is so abysmally bad that it more than compensates for the economic incentive.
RE: Delegation Issue