Just a few days ago Nintendo stopped some of the service for Swapnote, the visual message swapping service for the Nintendo 3DS. I must say that I’ve never SENT a swapnote though I have enjoyed receving the notes from Nintendo.
The issue stems from some inappropriate message being sent through the service, which Nintendo can’t prevent. Take a look at the full text of the letter posted on Nintendo.com. The letter was also posted as an alert directly sent to 3DS systems.