Ben Hanlin did just that, see how he got on in his youtube video (for those of you too impatient to watch, guess what...it worked). He's doing another one soon and it'll be interesting to see how he gets on.
Whether you like Ben's idea or not, what this 'experiment' does do is bring into sharp relief the way that social media can be a very efficient way of connecting people and that almost everyone is going to be touched by social media - even the people who don't have facebook, Linkedin or Twitter accounts (of course, you need to build a network in the first place in order to work it in this way and realise those efficiencies).
I for one hope Ben makes it work, but what do you think - social media experiment or stalking?