I operate a site with three related but distinct topics, each with it own discrete audience. I don't want to break it up into three separate sites because I'll lose too much link juice.
I'm developing a blog to improve traffic. From an SEO viewpoint, would it be better to use one blog -- perhaps as the site's home page -- or three separate blogs, each as the main page for the three distinct site areas (topics)? The problem with one blog is that most posts would not be relevant to any given visitor. And no, I will not be using category labels or tags to parse the posts for visitors. That option is out. Don't even ask me why. It just is.
I guess what I'm wondering is if Google blogsearch or general search views more favorably a single blog with, say, three-times-per-week posts than three separate blogs, each with once-per-week posts -- all else being equal.