Why am I always late to the good topics!?! lol. For me, it depends on the medium. I don't like the idea of posting pics of my soon-to-be kids (or me, for that matter) on the pregnancy forums (I'm an active member of 3). I love you ladies but there's so much anonymity on here (and personal stuff that we all share) that I don't want to share my personal details on here as well.
As far as social media, I don't care. It's open for the world to see and I'll share pictures at will. What's the worst that can happen? Some random person sees me and my family? Ok. Good for them. If someone is that gung-ho about stalking me, a little Facebook privacy settings aren't going to do much to deter them. (and...this might be me watching too much Dexter, but....I'd rather have weirdos stalking my fb then stalking me in a car down the street with their camera and telescopic lens. LMAO)
But in all seriousness, I've never been good at sending out holiday cards, or pictures, or any of that jazz. Facebook allows me to share with everyone I know, and allows other people (family and friend, included) to pick up the slack when I get busy. (What? I didn't post pics of our last visit? That's okay, SIL has them on her FB page).