I don't want to beat the same dead body again and again, but... I think this idea has came around for a pretty long time ago and there had never been yet a change. Probably because of staff and budget issue.
The creator/reader profile page needs more utilisation. Not only the message should reach app users too (isn't it what Tapas readers mostly consist of?), It is also better if we can use it to interact with them like hosting a poll or asking a question. The direct message also should come into a separate mailbox instead of ending up in the wall.
The change in how app users can see our messages alone can open for enhanced experience and engagement.