The first disclaimer we all read when we run through the home page of Skype or similar kind of applications is that we can't assume this to be a communication tool we can depend on in the case of emergency. Still I would like to propose a strong case for use of Social Networks in the case of emergencies of any kind.
While checking out my timeline yesterday I found a couple of interesting tweets. Now if you notice this caring and helpless father on a traveling train is asking for help by using 140 Character twitter as his 911 distress call. I would like to bow to the ingenious of this person and immense faith he has got on his tweeple (Digital synonym of People) If you check the tweet it has received 23 retweets !!! Assuming that every user has minimum 50 followers, in the first chain of distribution the message must have spread to at least 1150 people in a flash and if these 1150 chose to retweet in such case you can just imagine the number this whirlwind can reach up to.