Thing is mastodon is a microblogging alternative to Twitter. Personally what I enjoy about Twitter is the people, keeping up with certain friends. They are not in Mastodon so the experience felt dull.

Lemmy is a link aggregator alternative to Reddit. Personally what I enjoy about Reddit is sharing content and discuss in a more broad way. I don’t care to know the people, but the content.

On Mastodon, you follow people. On Lemmy, you follow communities. That’s pretty much it. I personally don’t dislike Mastodon (I use Pleroma instead), but I think, Lemmy and KBin are just so much more fun.
The fact they all can work together is cool as fuck. I can follow both people and communities, it’s awesome.