This is my work with my advisor. Our paper is online, take a look if you're interested. <a href="http://randomwalker.info/social-networks/" rel="nofollow">http://randomwalker.info/social-networks/</a> We also have an FAQ that answers the common misconceptions: <a href="http://www.cs.utexas.edu/~shmat/socialnetworks-faq.html" rel="nofollow">http://www.cs.utexas.edu/~shmat/socialnetworks-faq.html</a>