The only few that I've looked at were also on the Fox website, and maybe a few others. What they seem to me to be is the results of the owner's browsing on the Net. Full of links to sites they refer to. "Today this (link) is what I'm talking about, and what do you think of (link). Later I found (link) that led me to (link), etc., etc." Maybe they aren't all like that, but that is my impression.
I see Yahoo and other major providers are allowing web space for personal blogs, but I still don't have a handle on what they are, and if I were to do one what I would include. Seems like a lot of work to me, or an open diary that anyone can read. Can't imagine it myself!