You can follow an entire Lemmy community. If you do that, every COMMENT will show up in your Mastodon feed. If you see a comment you are interested in, clicking on it will give the post and the context for that comment!
Think of a banana split. Lemmy is the chocolate ice cream, mastodon is the vanilla, kbin is the strawberry, etc., etc. they are all different flavors. However, they are all in one “dish” that is the Fediverse.
Doesn’t matter what flavor of ice cream you are eating, it’s still ice cream at its base and thus they speak a common language underneath it all.
The best part is this huge spike just means more devs coming to the platform! Kbin is good, but maybe someone comes out with a new application that can easily do all of this even better!
This is the beauty of ActivityPub and the Fediverse! We are connected by our legit mutual interests, not necessarily connected by our street address or location!