I've found gifted groups on facebook before. I came across another one that was pretty active (something like parents of gifted children).
I didn't join because this is not something that I necessarily want everyone to see in the news feed ("JBDad just joined the group 'parents of gifted children'"). I relate a lot better to the people on this board, and even among my friends in the real world, I'm careful who I talk to about DS's giftedness.
But this is just me... And I tend to keep my FB time very social-oriented.
JB