At one end, people have their own blogs. (And Blogger, WordPress.com, and Tumblr are simple enough that large numbers of non-technical folk use them regularly.

At one end, people have their own blogs. (And Blogger, WordPress.com, and Tumblr are simple enough that large numbers of non-technical folk use them regularly.) At the other end, many people are happy to lurk without writing anything. In the middle, people post comments on others' blogs or on meta sites such as HN. I can't be sure, but from what you've said so far, I'm not seeing much unaddressed pain in the space.