I’ve seen things like the Obama blog or comments areas for various sites, and they mostly look like this one, only not as well spelled or moderated. (Yes, I’m a suck-up).
Now, I thought blog was short for Web Log, so someone keeps a diary or “Log” on a website, and then I guess other people comment on it. Here, anyone can start a discussion on anything. Is that the only difference - that we (the SDMB) are an infinite number of blogs? Because it occurred to me that I would have no idea how to answer if someone were to ask me if I blogged or not.
My interpretation is a blog is a public diary, where the owner may or may not allow others to comment on their posts. OTOH, a message board is akin to a bar/restaurant where folks come together and share what’s on their minds. The bar/restaurant owner plays no role in directing the conversations per se, but may contribute as any customer. The owner tries to maintain a level of decorum (moderating) and may charge for the cost of drinks and munchies.