I've seen wallets post messages.  I think about two months ago, the Zeitcoin wallet started giving me a message every time I started it about a Zeit-Knight event where new Zeit Knights would be anounced.  And there was an update.  That worked out great.  I updated my wallet.  Apparently a month ago, there was another update, but no message this time.  I only know about it right now because I just checked the thread to get a date for when the Zeit-Knight thing happened.  Ooops.  I guess I'll be updating that wallet.  Knowing that they have messaging technology, why the hell wouldn't they use it?