We did it over the holiday weekend with our close family last weekend. We had a copy of the us pic for grandparents and made a card that said "Congratulations! I can't wait to meet you (Grandma, Oma, Papa, Opa etc). Also my DS wore a shirt that said "most awesome big brother" He made it all the way through dinner though and nobody noticed lol.
I'm not sure about doing the fb announcement thing this time. Everybody that truly cares already knows.... the rest will probably figure it out soon enough