Social let me boost a "followers only" post
I posted something in "followers only".
This is how it looks in the Mastodon web UI:
And this is how it looks in Social:
Notice how the privacy status on Mastodon is displayed as a lock, to indicate it isn't entirely public. However in Social it is the "boost" button.
And as it turns out Social lets me boost the post!
After I boosted it in Social, it looks like this in the Mastodon web UI:
So it seems the post really was boosted?