I did a fb announcement. We had already told most close friends and family beforehand though, but not all. A fb announcement was an easy way of making sure everyone knew at the same time! We also struggled to conceive and our DD is an IVF baby. Most of our close friends knew of our struggles so it was really nice for us to be able to acknowledge and celebrate the pregnancy publicly as most people knew how very wanted it was and that it had been a long time coming. Having said all that, that was my choice and if someone else chooses to do something different then that's ok too.