Proper content and content consumers are the key(s).
On a properly working platform (even in the smallest Facebook groups) you will receive comments under your posts, even if you do not write comments under other people's posts.
Real, actual interest in the content.
Usually this is why people go to a social network. Either to find a content that interests them, or to create a content, which also interests them (and others too).
Natural usage.
Something we currently very rarely see on the Hive blockchain.
Hive users mostly either do not write comments at all, or they force themselves to write comments, because they see this as a challenge, contest, competition, or any similar thing.
The approach of the majority of the users is generally deciding the success or the failure of a platform.
In the case of the Hive blockchain, it is the latter (failure) so far.
People rather go over each other (do everything to get attention to their own posts) than to use the platform naturally.
Otherwise the Hive blockchain is a technologically revolutionary platform.
Very sad that the majority of its users are currently ruining it with their approach/behavior.
Good for you. You are amongst the very few.
I (and most of the Hive blockchain users) rarely receive comments on the Hive blockchain, and even if I/we do, it is often spam-like, or simply feels forced.
Anything, but not natural interest.
While on Facebook, people actually and always actually truly care.
Sometimes they even write private messages too in addition to comments.
And in two topics. Birds of prey, and amateur radio.
Both of these topics are unique, and they are naturally standing out on a properly working platform.