Maybe somewhere in the world, at some specific time, someone used social media to save their life. I'm sure that's in the realm of possibilities. The most likely situation if someone is using social media as their 9-1-1 is that they're just looking for attention. It doesn't matter how many retweets you get if you're getting stabbed. Everyone knows this. That's why it raised immediately red flags when this Facebooker-in-danger posted about their supposed break-in in progress.
First off, I don't live in a place big enough for there to be anywhere to hide if a break in occurred, so the entire concept of doing anything other than screaming is completely lost on me. Secondly, if someone is breaking in, get the hell off social media. Now, this Facebooker almost got away with their lie when called out, claiming they couldn't get to their phone. Too bad people on facebook are the pettiest sleuths you ever met. They quickly pointed out, "you wrote this via mobile..." YA BURNT!