Is blogging narcissistic?

I don't think that blogging is narcissistic but it's a way to try to be attentioned by other people.
Sometimes I feel weird becuase of some people who post their feelings in their online diary. I can't understand why they put their sadness on the internet. Those kind of diaries make my feeling bad because whenever I read the diaries, it seems that they want other people's consolations on purpose. Also sometimes they look selfish.
So, I think blogging is not narcissistic but posting their feelings looks not good.