How useful is a blog?

At Haliewa Joe's in HI.

I see more blogs that focused as tools for selling than journals about the authors life. Barely anyone I know uses them to about people in their lives. Sure they cover the big events like births and weddings, but I always thought a journal also contained your thoughts on other people, what you did or didn't like about them, your learning experiences about them. We're tribal, and before stuff and work comes how we socialize with others.

But the blogs I read are mostly about careers, art, crafts, tech, and 'big' social events. Do the same people who write those blogs write elsewhere about their lives,
their travails, the gossip? Or do they just talk about to their friends, and then its' gone, never to be read about by them or others, years later when they wish to retrieve that moment. Sure they knew what recipe they were experimenting with, or what shop they visited or cheese they ate or who's book was recently published back in June 2006, but who were they fucking, and was it good? Was it different than it is now, and what did they think about that person?

I certainly want to know about the recipes and cheese and books, which is why I subscribe to those blogs. But I wonder if they keep their other personal info on those blogs as well (as private entries), or write them in a private place and put it on a shelf (always nice to write by hand, but you can't do a fast search for a name or place by hitting ctrl +F, you have to skim shelves of pages of scribbles), or don't even put them to paper at all. Letting those moments that truly define their humanity slip away, to only be half-remembered decades later as a fuzzy recollection mixed in with the definite sharp knowledge of a cheese they discovered around the same time.