No. You reach people where they are.
I have disagreements with using fb and so on for that, but it's not the same as explicitly marketizing whonix to facists.
Thought the later has changed, at least on the surface.
With fb you promote centralizing all global communication (from completely private to completely public) into one US company; with all it's implications, like steering "trends" up to complete censorship, ...
It's just the much lower hanging fruit. Also because fb is so accepted everywhere. But the larger problem is fb, and not a handful of facists (if they are the problem, make people resistant, e.g. better education, ..., instead of hiding them).
... and last but not least:
> You reach people where they are.
Yes, it's always the same argument. I've stopped counting since long. And it's always wrong.
It's quite tempting, obviously, yes; but by that move you pull in a unsolvable contradiction to your statements about "privacy and anonymity".
It's like going shopping to the butcher, even if vegan, just because this shop is around the corner. You can't solve that by just a calendar motto.
As a bearable compromise, you (i.e. they) could have a fb page where you pick up the people and bring them to your homepage. But once they are on your website or even have installed your stuff, I don't see any point to provide them links back to fb. That direction of flow is not what you want to have (and if the user actually wants, he will find to facebook without yet another fb button, I'm sure).
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