From the little I’ve read, it seems the idea of a Portable Social Network is really more about Personal Information Portability. Is it just about bringing your contacts with you? For me, it is important to be able to also take my conversations, or at least my comments, with me.
I think of the blog platform I use – WordPress. WordPress allows me to import my posts and comments for a variety of platforms and standards.
It would be great for these services to allow me to choose what I want to take with me, it spits it out in a given format, and then I can simply plug it in anywhere. But again, more than just contacts.
Perhaps the discussion should move towards what to take with you and define standard elements of each of these traits.