Sites that cared about "above the fold" were part of the problem, not part of the solution. The primary reason one would be actively interested in putting content "above the fold" was if one wanted to "capture audience", which is generally not the first thing on the mind of a person posting deep information as a labour of love.

The Facebook feed is necessarily long (in fact infinite) and low-density, so scrolling it is a necessity.

But individual entries are definitely advanced examples of "above the fold" design that is good for advertisements, not for pages.