Does my instance only get copies of statuses on other instances if at least one person on here follows them?

I run into situations where I find friends on other instances and most of their posts are missing. I'm guessing it's because we're all new to Mastodon and aren't being followed by people on every instance.

Is it then not possible to reply to an older post of theirs from this account?

@acjay I am not sure I even know what you’re talking about, but I will say I think some of this is CLIENT behavior. I moved from Mastodon to Metatext on iOS and I think the behavior has significantly changed. People are interacting with my posts more, I am seeing more content

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@Ilovelemons I'm using the web client for my instance, so I think I'm just getting whatever data the instance has. But I don't yet understand exactly how federation works.

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