I am 16 wks with DC2. With DS I sent a round robin email to everyone i knew and spilt the beans that way. But that was because I was very excited and also overseas at the time.
This time, I have told a number of friends and family face-to-face but that still leaves a large number of friends-i-don't-see-that-often and acquaintances...is it crass to do a facebook announcement (it feels a bit impersonal and, well, teenagey!)...
But i feel awkward about just not saying anything, especially if i end up seeing them after the baby's out or want to do a 'meet the new baby' announcement! They might be thinking, why didn't she tell me she was pregnant? WWYD?