Congrats! We told our parents and siblings after the first ultrasound around 7-9 weeks each time. We told everyone else at 14 weeks last time. This time I think I am waiting until 16 weeks to tell work (for career reasons) so I'm going to keep it off Facebook until after then.
Congrats! I'm one of the late to tell people types. With #2, I told most people at 13-15w. Still no FB announcement. Still haven't told my work client at 21w (doesn't affect them because my contact ends well before baby is due).
I waited to tell people IRL until we saw the heartbeat and confirmed it was only one baby in there and all looked well. The risk of miscarriage is very low after the heartbeat is present, so that's why I waited until then.