>>I just thought, thas somebody simply made a mistake and clicked "post" without filling other fields in the message form, and nothing more.
You know, Tatiana may be right! LOL! I just posted that "no author" message above by clicking on post but not entering any text. I feel a bit silly now!!... but then, you have to go through two clicks and a warning message to post that empty message. Was the "no author/no message" post deliberate? Was it just a mistake and our responses to it purely projections?
Ah... we may never know!