Having tried all three, its a stark difference in how much more social Lemmy is comparatively. Its not even close. Almost all posts I've encountered on lemmy have interaction; whereas, more often than not, posts on the other two platforms have no interaction. Wonder what the driving factor is behind this difference?
Why are you comparing apples to glass bowls?
Lemmy is a reddit clone, where you create communities.
Mastodon is a Twitter clone, where you share what you ate last night or what political meme you like today while sharing photos of moss and/or windows.
Nostr is its own thing.
You can't really compare them with each other.
Yeah, I get your point. But the question still remains. Lemmy objectively has more engagement/interaction regardless of the category of social media of each medium.
If you compare X to Lemmy, X has more engagement/interaction... And they are separate social media platforms categorically. Yet, Mastodon trumps Lemmy's user count by nearly 10 fold...
It stands to question that with a fraction of the users on Lemmy, why is the interaction/engagement considerably higher?
Mastodon User Count Lemmy User Count
An average post on Mastodon/X/Bluesky/Threads is "this is what I encounter" or "this is what I believe". Those kinds of posts don't specifically ask for a response. You can respond to it, but it doesn't require one.
That's not how you communicate on Lemmy or Reddit.
That's the difference.
Each platform has its own usages.
So to compare and say "well platform Y is more social, because there's more interaction than on platform 2" is a bit weird.
You wouldn't compare a letter with a message board on a town plaza either. Both can be used to communicate, but they're not comparable to each other.
Or in another way:
On Mastodon or Nostr, when you post something only a small subsection of the userbase actually sees it (only those who follow you, those that follow any of the hashtags that you used, or those that check the full firehose).
On Lemmy the entire community you posted it to can see your post.
Obviously you can get more response on Lemmy! More people get to see it.
Twitter have big interaction because user count is extremely high. For a microblogging platform maybe it requires that it needs lots of users and some "creators" who are followed by thousands of people, unlike communities which anyone can post and everyone joined the community can see.
I also think upvotes and downvotes plays a role too since mastodon does not have them(only boosts but boost actually shares with your own followers which might be very low)