How to write better comments?

There are more articles about how to write great blog posts than the same on commenting etiquette. Here I have tried to summarize all my blogging and social commenting experiences as a single blog post. In a four years long blogging life, there were several events when my comments were taken positively & produced great discussion environments. I have also faced those nasty moments when my words were criticized and harassment took place. It may happen to any of you,…