When my father passed away in January, after all of the immediate family/friends were notified, I posted a wall post about him passing. The next day, when his obituary was in the paper, I "shared" it on my facebook wall. My friends from high school and college were not aware of his lung cancer before he passed - I was never able to bring myself to write it in a "public" forum of my private page. It was easier for me to share the information that way, in a one-shot deal. I was so thankful for the words of support and encouragement that I had received from everyone, in person and via facebook.
EDIT TO ADD: By posting his obituary on my page, it allowed friends/family outside of the newspaper region to read it if they wanted to. It is not always easy to know what newspaper published the obituary.
I am pregnant and plan to do something similar once Little Dude is born - share the information with immediate friends/family via phone calls but will post the information online for everyone else.