What exactly is "Shit posting"?
Just because I did not write an essay does not mean what I wrote is off-topic - if you read the threads, you will observe my posts are not off-topic.
If they were off-topic, they would have been deleted.

You don't have to write an essay to make sensible contributions.

Are all posts supposed to be long in order not to fall into the "Shit post" category?

Kindly define "Shit Posting".