Help! Help!, please!

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Maybe someone can help me with the following. It takes a little explanation, so indulge me here. I write a comment or“like” a post on friend A’s wall. As a result it posts on my wall that I did just that. I write a comment or“like” a post on friend B’s wall. It does NOT post on my wall that I did that. What settings are involved here? I assume it is the difference in how friend“A” has his settings configured vs. how friend “B” has his settings configured. If that is not right, please explain what’s happening. Whatever, how do I get the comments made on friend“B”s wall to behave like friend “A’s”. (My motivation here is that I am helping friend“B” get “more exposure”)