Usability 
Posterous, the popular lifestreaming and instant blogging service,has mobile enabled all Posterous blogs using an attractive, one-size-fits-all mobile theme.
Posts include comments, which are displayed on the same page as posts. It doesn't seem possible to leave a comment with the mobile version.
The single-column mobile layout has an average front page size of 38 KB which should work with most phones. However, the individual posts are not paginated and images are not re-sized so post pages can get quite large. Source: The NextWeb
30-April-2013 - Aquired by Twitter and shut down.