The point of making blogs is to share general information about facts someone might want to know, or you can share personal stories about your life and then you can get comments from people that you know in person on your blogging site or people that you just don't know.
I believe that people whom blog in some ways can be and can not be narcissist. I think they can be because it depends what their opinion is on the topic being discussed, and then that may lead them to be nasty and critical. And, I think that they aren't because if it were a topic they wanted to help out someone on, they wouldn't lower the person's self esteem- it's a win win answer.
I believe certain people who communicate via blog website usually bring people closer together because they are having a great discussion on something and they don't necessarily argue. Then when that person gets seriously ill or doesn't go on the website anymore then the person who is not ill or what not well start to notice and feel very emotional.
All types of blogs are useful depending on what the specific audience.
News and technology blogs are useful because someone might be interested in one or the other and even both and want to post their opinion on the topic, or if the person has a question about either then they can get their answer specifically. You can usually tell if something is trustworthy or not by how well they wrote it etc, or by looking up the person's name who wrote it and by other comments before and after it. They can change how you get your information because, honestly, they can put what giberish,they really think is the answer, but compared to a newspaper article , etc, then the facts have to be true to word so once a again, a win-win answer.