I’m not claiming this makes your Posterous anonymous at all, but if you would like to hide your profile information from being displayed on your Posterous site/blog/whatever:
- Go to “Manage”
- Go to “Theme my site”
- Click on “Advanced” and name your new template
- Expand the editor using the link on the right
- Remove everything from and including <section id=”profile”> up to and including the relevant occurrence of </section>
- Repeat for other sections if you want to remove contributor lists etc.
Note: I don’t see why a theme would be made this way, but if you were using a theme that had a section inside a section, this might get more complicated. Seek advice if you aren’t sure. Then again, Posterous tells you to save a new template anyway so what have you got to lose? Go crazy.