Okay, I think it's time to discuss the concept of "suspension of belief", and, how it relates to Blog Fiction. If you've never heard of the term, I'll direct you to this media glossary article.
When it comes to Blog Fiction, the reader must also suspend their disbelief and accept that they are reading the blog of a fictional person. If the writer of a blog fiction wants the reader to believe that they are reading a blog of a fictional person, that illusion needs to be maintained as much as is practical.In the world of fiction you are often required to believe a premise which you would never accept in the real world. Especially in genres such as fantasy and science fiction, things happen in the story which you would not believe if they were presented in a newspaper as fact. Even in more real-world genres such as action movies, the action routinely goes beyond the boundaries of what you think could really happen.
In order to enjoy such stories, the audience engages in a phenomenon known as "suspension of disbelief". This is a semi-conscious decision in which you put aside your disbelief and accept the premise as being real for the duration of the story.
So why do I see so many blog fiction sites where the *Author* is the one responding to comments? When this happens it completely breaks the illusion of reading a blog. It is a reminder that you are reading a blog written by a writer not a character. It jars the reader out of the illusion - and that is not good if you want to keep your readers interested. Evangeline's ride is a good example of how jarring it is. Almost every entry I am thrown out of the illusion when I read about how the Author has been busy, or how she's improving her writer, etc...
Some sites, like Fate's Acquittal, started out leaving comments as the Author, but transition to responding "in character" as the story unfolds. I think it got better when this happened as it allowed the writer a second tool to reveal what the character was thinking. It also gave some foreshadowing for the thorough reader.
To those who are reading blog fiction, this article is for you too. If you're reading a blog, be sure that your comments are left for the character as well. If you want to talk to the author directly try looking for an email somewhere on the site. Please don't be like Ian over at Flyover City. In this case you, the reader, are ruining the illusion for other readers.