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Even if you are Google, and you know every search your users do, every document they write, every chat they have - you still don’t know their facebook social graph. You don’t know their tweet stream. You don’t know the books they bought on Amazon.

For users to have true data portability, there needs to be some consensus on both the APIs and the formats needed to transfer / represent this portable data. It may be that a number of APIs and formats are required for different scenarios. The Semantic Web is an ideal means for representing the data to be ported from social websites, in that is well suited (using vocabularies like SIOC and FOAF) to represent how people and all kinds of objects on these sites are connected together (documents, discussions, meetups, places, interests, media files - whatever). Of course other data formats may be used, but most importantly, it would be a waste of time to come up with a bunch of new formats for representing the data that needs to be portable, because a lot of work has been done on how to best provide interoperable, reusable and linked data through efforts like the Semantic Web, AtomPub and the microformats community.

if you're familiar with XFN think of findmeon like this: findmeon can let your 'xfn rel="me"' items be anchored to a digital signature. you can then either publish the public key, so that everyone knows for sure that those xfn relations are legit and not spoofed-- or you can not publish the key and have multiple circles/networks of 'xfn rel="me"' documents which are only brought together when someone is provided with a shared public key.

XRDS-Simple provides a format and workflow for the discovery of resources metadata, and other linked resources. As web services continue to grow, applications utilize a wider range of web services and resources across multiple providers. XRDS-Simple allows providers to document their resources in a machine-readable way, which can be automatically discovered by consumer applications.