"Trapped girls call for help on Facebook"

When I heard this one on Wait Wait Don't Tell Me this weekend, I was intrigued but skeptical. Sure enough, it was the true one. Two girls in Australia who were trapped in a stormwater drain (?) used one of their phones to post their situation to Facebook. No call to their 911 or anything. A friend saw the news on Facebook, and called for help. Here's the report from the ABC.