If you want to develop a personal brand in some area, such as entrepreneurship, then you need to run a blog focused on that issue.

At the risk of exaggerating, “my whole life” blogs are for young people and for people who don’t care about building an audience. LiveJournal was for teenagers.

The more specific the blog, the more you are able to develop an audience for that niche.

By contrast, a blog that contains everything in your life will only appeal to your friends.

There is a deceptive almost exception: people who are funny. They seem to break the rule. They seem able to talk about whatever they want, and they still have an audience. But in that case, they actually have a niche: humor. Everything they write is funny, so people who like humor read it all.

But unless you are reliably funny, stick to narrow topics.