Blog platforms have moved to enterprise field under this analysis:
1. Blogger is for one employees companies that can run by adding its domain under the Google Cloud.
2. WordPress is replacing Drupal sites and more and more companies is moving from html or flash sites to WordPress themes that has all but a blog look and feel. This includes Paypal and ecommerce ones.
2.Posterous is gaining share against typepad and other good but no free Blogs.
This is why we have leave Blogger and delete our Drupal, Joomla sites for WordPress and Posterous sites.