Do you have a corporate blog or are there reasons why you don't have a corporate blog?

I am looking for:
- corporate bloggers,
- companies that have a blog
- companies that have thought about blogging but decided not to.

My dissertation discusses the positive and negatives effects of corporate blogging. I would like to include the perspective of corporate bloggers or companies that decided not to. Are you (or your company) willing to talk about why you started a corporate blog, how you promote your blog and what the effects are? Or why you or your company decided not to?

Please leave me a note or reply privately. Many thanks