Portable Social Networks: Take Your Friends with You

http://www.sitepoint.com/article/social-networks-take-friends/2

When importing data into a new social network, formats like XFN and hCard allow you to describe both the person, and his or her relationship to you. XFN is used to find links to the people you consider friends. hCard is used to extract structured information about those friends, including things such as URLs, email addresses, organisations and phone numbers, all of which can be migrated into other services through the use of open data.

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