I believe if user A makes a post on their own profile and on visible to, a menu pops up and they get to choose who can see post, for example if user A chooses "public" then the post appears on home page and their profile and so forth, which then user B can see post on home feed. I feel like i am solving a puzzle over here and on a Monday afternoon and snow coming down, not a good combo....lol

I am B, When MY friend A posts and it shows on homepage, that's public domain. That is seen by ALL members, even those who are not A's friends.

Me - B, as a friend to A should see A's posts on my timeline. Not until I visit A's page or homepage.