There was thou. The only way you could get a spot pass stwapnote was by exchanging FCs. And you can disable street pass. Since they kept street pass and only took spot pass away that has to mean that those swapping pictures gave each other their friend codes.
Yea. But what I mean is by having the ability to block anyone you might have exchanged FC's with that sent you offending stuff. It's a risk regardless, but at least that would have been another safeguard.