On the Steemit version of communities, there is a button that allows the ‘community’ post to be ‘posted to (personal) blog’.

That’s feature not available on Steempeak communities, I noticed.... or is it, and I missed it?

Also, I’m assuming then that even if a community is ‘members-only’ then the content will show up on old-school Steem feeds? Or will the content be private and viewable only to the members? Is that something that is or will be possible?