the question is in the title, really! :-)
not sure if it's the done thing? we got one from DH's sister last year, but then she's American and the type to have a "gender reveal party" (true fact).
for DD1 we were paranoid of becoming obnoxious self-obsessed parents, so we didn't put anything on Facebook, didn't make any grand announcements, just told friends and family one by one.
for DC2, on the way... I'm thinking it'd be more efficient to make an official announcement, in the form of a mass email or e-card. Both DH and I are foreign, and our friends and family are all over the world, we communicate regularly with some but not all. Last time it was a pain to have to call/email everyone to let them know.
but I'm still paranoid of being that parent who wants everyone to make a huge deal of the fact they're reproducing...
so, pregnancy announcement cards, yay or nay?