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> Facebook is like FacebookOS, it probably has emacs somewhere in there. The size of functionality that FB provides is like a Mammoth (one of the ones standing on a turtle with the world on its back).

I'm aware of that. The question is: how much of this functionality is actually used and appreciated by the users?

> Maybe something simpler with some subset of the functionality that some subset of users care about.

I'd venture to say "the majority of users care about". I did some amateurish research a while ago asking people how they are using FB. Most just scroll the feed, chat via FB, click "like" and occasionally comment; some participate in FB groups. There is a ton of functions rarely used, and some are deliberately broken (for example, FB deliberately removed past birthday notifications to create a sense of urgency to log on more often, and you need a workaround to catch up if you log in less often).

If you actually start using HumHub and compare it to FB, the former is a real pleasure to use. Will it ever have more users? Practically speaking, it's impossible. In any case, my point is not how fast one can create a usable FB clone, but that the code itself is no longer something that need to be jealously guarded.