I'm not a huge play by play type of FB poster, but I wanted to let my friends & family I don't see as often know about our exciting news. I posted our pregnancy announcement at 17.5 weeks, which is later than most people usually announce. Last week I had to post the birth & loss announcement. While it tore my heart out, I was not kicking myself for having announced it on FB. Having people know did not make the pain of our loss any less and we received/are still receiving a lot of thoughts and support.
Did your loss or will your loss affect how you treat your current or future pregnancy on social media?

TTC since 10/2010
IUIs # 1-5 = BFFN
IVF # 1(July 2012) = BFN
IVF # 2 (November 2012) = BFP (MIssed MC D&C @ 8w3d on 1/10/13)
IVF # 3 (June 2013) = BFN
IVF # 4 (September 2013) = BFP Fraternal twin boys! (Loss at 21w6d due to IC on 1/26/14...devastated.)
3/21/14--TAC (transabdominal cerclage) w/Dr. Davis in NJ
IVF # 5 (May 2014) = BFN
FET (August 2014) = BFN

Re: Social media
We announced our first pregnancy around 12 weeks and when we lost Alice at 20w4d we also announced on fb. For me announcing our loss of fb helped get the information out to a lot of people at once so I wouldn't always be explaining when I ran into people. I was definitely far enough along that most people knew I was pregnant when we lost Alice.
This pregnancy we waited much longer to announce and I wasn't even sure I wanted to announce it on fb. I know it would have no impact on the outcome of the pregnancy, but it was scary to feel hopeful at all with this one.
My first pg we never posted on FB, mainly bc I was waiting to hit 13w. Than at 13w appt we found out we lost the baby.
My son we announced after a good 13w u/s.
Last pg I announced after 15w, bc I was waiting for blood tests. I announced on FB when we lost Timothy at 24w. Like PP said it was a easy way to get the word out without having to explain to EVERYONE what happened.
If we try for another child, I don't know what we will do.
BFP #1 March 24, 2010; missed m/c May 26, 2010 @ 12w 4d; D&E May 28, 2010
BFP #2 Oct 20, 2010; My little boy was born on July 5, 2011
BFP #3 April 30, 2013; Chemical Pg May 5, 2013
BFP #4 Aug 22, 2013; It's a boy. Loss discovered at 24 weeks on Jan 15, 2014 (cause CMV virus)
BFP #5 April 6, 2014; missed m/c May 15, 2014 @ 9 weeks; Misoprostol May 15, 2014; D&C May June 3, 2014
I posted with our first pg at 16w when we found out we were having boys. I posted a few days after they were born about the loss. And I continue to post about them and how I feel etc. we waited until I reached 24w to post about this pregnancy. I wasn't going to post anything, but I figured I have a baby shower coming up and I thought pictures would get posted so it needed to be said before hand.
Ticker warning (rainbow mentioned)
When I was pregnant with Kayla, we announced at around 13 weeks. We announced our loss on FB as well because we wanted word to spread quickly so people wouldn't still think I was pregnant and have to share the painful news in person.
Before I got pregnant with this LO, I had toyed with not really telling anyone outside of close friends and family until she was here, but then decided I would like to celebrate her with a shower, and that would be kind of hard is most people didn't know I was pregnant. So we waited until we passed our loss milestone to announce. I know announcing earlier wouldn't have made something bad happen, but I just couldn't do it until we got past that point.
My Pregnancy/Parenting BLOG TTC since 5/2011, BFP #1 12/3/11, M/C 12/7/11 @ 4wks 2d. Began seeing RE Sep 2012. October 2012 Metformin 1500 mg= ovulation on CD34 BFP#2 11/14/12 9DPO, EDD 7/26/13, DX Gestational Diabetes @14 wks, our angel born sleeping 3/24/13 @ 22wks 2d. BFP #3 7/4/13 8DPO EDD 3/22/14, DX Gestational Diabetes @14 wks. started insulin @16 wks. Our rainbow, born 3/19/14 @ 39wks 6d., we're so in love!
Now I am so aware of how painful it is to see an announcement that I probably won't ever announce on it. Silly I know but it is what it is.