Just like in the offline world, formalities count even online. Sadly, too many people forget this when they interact with others on the net. I’m sure you’ve seen hundreds of these people yourself: they are the ones who mindlessly go about on every site and blog they can find and selfishly promote themselves without any regard to other bloggers and site owners. They keep touting their own horns as loudly as possible and don’t care at all how many people they offend with their rude behavior.