The question posed by the class is how professional does one need to be with a blog and how personal can one get.
When to be professional
Blogs can take the form of news posts and the reporting of facts. For the Social Publishing House blog, we have a section specifically for press releases and information updating the status of writing contests. In these areas, its important to be very matter of fact and professional. It leaves little room for discussion and personal opinion.
When to be personal
The use of the first person in a blog post can make it feel very personal to the reader and allow them to connect more to the content. It can be effective, but it has to be used in the right matter.
For example, blog posts that I write for the company normally are impersonal and do not use the first person. Most of the time I use the second person, addressing the reader directly, which can also be just as personal. In these posts, the topic usually covers ways they can improve their writing or things they have to look out for.
Audiences respond to different posts, and its a good idea to diversify the posts. So where I am more impersonal and matter of fact, I bring in writers who use more "I" in their posts to draw in attention. One writer give his opinion on books that are read that will eventually turn into movies. Sarcastic as they may be, they appeal to particular kinds of readers that would shy away form the matter of fact posts.
What Makes Sense
At the end of the day, it matters what you are writing about. If its reporting, be impersonal. If its about a new book or movie coming out, its more opinion and can be more personal to the writer. But as a business owner, its important to have a balance of content that can reach to several different target audiences that you are looking for.