Facebook has determined that each user of their site is worth as much as $200.

Facebook has a benchmark for this tho: advertising sales. I also think the $200 is yearly value, the lifetime value of a FB addict is undoubtedly much higher, especially given that everything is designed to be as addictive as possible and that the news feeds advertising sales are NOT shared with publishers, unlike ads in for example instant articles.

It is very difficult to estimate any LTV of any user on a platform like Steem without having any benchmark whatsoever. If Ned gets what he wants, then we will be able to do so because in his vision advertising (brand profiles) will become a big thing on Steem.

But until we implement at the very least of model of native advertising (think in feed), there is nothing to benchmark against. Unless you want to take the STEEM marketcap and divide it by number of active users.