Check this out – IdentEngine is a javascript library that starting with something like an email address or profile url, will search across the social web, relying heavily on google’s social graph APIs to compile a master profile. 

With the form autofill component, you can actually prefill forms based on information found and guessed based on a single point of data.

Example:

var doc = jQuery(document);

doc.ready(function () {

ident.useInwardEdges = true

doc.bind(‘ident:update’, renderProfile);

ident.search(‘http://twitter.com/glennjones’);

});