View Message

I sometimes don't mind nns when they are just a simple shortening of a longer name (Joe for Joseph) but usually prefer the full name. I would be in the same camp as your friend - if you are going to call her Ann, then just name her Ann (although please spell it Anne).
I much prefer the full name Malcom to Mac. On the flip side, I don't like Cornelius, but if you are going to call him Neil or Conor, then just name him Neil or Conor.