If, for whatever reason, you want to post under an alias, you may want to keep a website for things you want people to attribute to you, and a blog for thoughts you don’t want to be directly associated to you.

I have an informal "about me" page on my blog, and a more formal, professional profile on linkedin. Each links to the other. That covers it for me.

Think of it this way: If you can split the car in two and both halves can still drive, then split them. If not, keep the engine where it belongs

You could split them into different categories on the same blog.