I am pleased to report, I've been monitoring the Formspring.me abuse and they're now keeping on top of it, so all abusive pages created, are now being taken down relatively quickly.
Still seems to be the same IP responsible for at least part of the abuse (18.104.22.168 - IP is well known for comment spam). Whether or not this is the same IP actually creating them in the first place, is something I'll be finding out.
IP for those wondering, belongs to the chaps at Inferno.name (surprise surprise), no strangers to criminal activity;
Formspring.me: Second verse, same as the first
Formspring.me abuse continuing
Alert: formspring.me abuse surge