To have left someone a question on formspring.me. DEFINITELY NOT THE SAME THING AS FORMSPRUNG. However, to have formsprought someone may definitely result in whomever you formsprought becoming formsprung
Girl: Hey I totally formsprought you.
Boy: Oh yeah? I'll have to check it out.
(2 minutes later)
Boy: I'm formsprung. You will have to formspring me more often ;)