Professor B J Fogg of Stanford University can help you do this. He has a whole course based on it.
“The Psychology of Facebook” class at the university in California delves into what Professor Fogg describes as ‘a new form of mass interpersonal persuasion’.
He said the pivotal moment came when he watched an application on the site go from “literally zero to more than a million users in a week”. (http://news.bbc.co.uk/1/hi/technology/7357934.stm)
You can even join the Professor’s very own Facebook group!