I've just purchased Maltego v3 and I must say, it's pretty awesome!! I actually noticed the article on this site http://www.ethicalhacker.net/content/view/324/2/ and was attempting to duplicate the results.
It turns out that I don't have the [social network membership - rapleaf] in my transforms. I searched the transforms in my install and didn't see it. I also discovered transforms and it didn't show up.
I'm not sure if I have to register this first before it shows up, but the link is broken too.