Possible, sure. Anything is possible. But you're acting like Formspring bullying was the one discrete event that pushed these kids to suicide. These people were clearly subject to offline bullying as well (by the same people), it just so happens that the formspring variety leaves a paper trail.
I'm not an expert on cyberbullying, but there were a few cases that happened when I was in high school. At least at the school I attended, the victims had never been accosted by the bullies in person. But then again, I have a single-digit sample size.
