Swapnote, Nintendo's drawing and messaging program for 3DS, has been suspended as of yesterday. They're concerned about the sharing of "offensive material" over the service.
According to Nintendo's notice, users, including minors, have been exchanging friend codes on the internet, and then using Swapnote to share offensive material with each other. Nintendo feels that plugging the SpotPass feature of Swapnote is best for halting misuse.
I wish I could see some of these notes!