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Seen it a couple of times, I suspect it’s a Lemmy thing, something like: whenever your instance starts federating a community on another instance —likely because another user on your instance just subscribed to that remote community— the server starts pulling in posts from the remote instance. Those are simply (wrongfully?) injected at the top of your page as they flow in.
I’ve only been on mastodon for a couple of days, but yes it is active, and depending on what you’re after it might we worth it. For me, it seems to be a nice mix of keeping up to date with things and people I already know, and at the same time stumble upon (related) things I did not yet knew about.
You will have to put in some effort to follow people/accounts/hashtags, but that’s kinda fun. Just try it out!