LOL... a nurse wouldn't lose her license for having a patient on her myspace page. There is nothing unethical about nurse/patient speaking to one another outside of the medical facility.
Maybe it just freaked her out a bit that a patient went home and took the time to look her up on myspace.... usually patients just send a nice thank you note with a box of cookies.
There are lots of people who are not up to speed with technology and all the means of communication with it. She may very well only use myspace for her family and personal friends.
Who knows... maybe she just smoked a big fat doobie and accidentally hit the delete button when she meant to hit reply. Or perhaps FDD took too many pills and he's imagining the whole thing