If you post from your own Diary as a Buddy you can add this post to multiple users' Diaries at the same time. To do this simply:
1. Log in as a Buddy
2. Go to My Stuff>Diaries> ‘My Diary’
3. In your Diary add a post and click the ‘Add to user Diaries’ link
4. Select all the users' Diaries you want to add it to
5. Post the Diary entry
