Art of commenting- Genuine, Fixed and copy mechanism

When you open a post there is 99% chance that you are going to make a comment on that one 

And if you read that post then you can make genuine comment according to the content of that post 

If you are not reading that post then you can make some fix and predictable comments on that one 

Some user even follows the copy mechanism, where they just copy someone else's comment on that post or relatable comment