As far as "sharing scores" I've learned to do it for educational purposes. I have one or two close friends whose children tested as PG (higher scores than my son). We occasionally talk about scores and what they may mean.
As far as talking about giftedness, when I first got DS's scores, I was so excited that I made the mistake of bringing it up a few times. Now, I kind of wish I hadn't- I feel like every time DS acts like the seven year old he is, that folks are judging. Kind of like the hilarious Gary Larsen cartoon where the kid keeps trying to push open the door to the gifted school (sign says pull). DS has plenty of those moments:)
I've learned to know my audience.