User blog comment:Dopp/Communicate Easily with Message Wall/@comment-3123266-20110929024407/@comment-1656630-20110929164936

Oh, and quick clarifications:

4) In the current plan, once you enter text in the screen, a "Post" button appears (and we're considering adding a Preview button, too) -- so pressing "Enter" just gives you a line break -- doesn't post the message.