Bear with me here…I want to make sure we are talking about the same thing.
You log into FB. What immediately shows up is your Newsfeed. It’s like a customized newspaper just for you. The contents displayed is made up of your FB friends’ posts, as long as they allow you to see them.
Let’s say that your partner posts a link to an internet article. You post a comment about it below the article. The comment, along with the original article, will show up in your Newsfeed. The comment, not the article, will show up on your Wall/Timeline unless you have controls set in place to prevent this. The article and comment will not show up on your other FB friends’ pages unless they are also friends with your partner. Your comment will show up in the Newsfeed of any FB friends that your partner has.