I told my Mum the day after I found out. She's my best pal and the most supportive person in the world. (She told step-dad soon after)
We told DFs parents and our siblings a couple of weeks later, then best friends and employers.
That was meant to be it until after 12 weeks but DF got carried away and told his lot at work, and his friends from uni. Best friends told their parents, who told their friends at a bbq a couple of weeks ago.
DOH.
But if I have it my way (which I should, after the tantrum I had over too many people knowing too soon!), nobody else will find out for another 2 or 3 weeks. Basically, when I have my 12 week scan, I will find a way of letting my family know. But I would like to try and keep it off facebook til 16 weeks but thats nigh on impossible these days.