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"MyBlogLog has a nifty new feature: you can now add any user's contact details to your address book via a vCard/hCard icon that are visible on the profile page. \nvCard is just your usual contact info sharing standard; clicking it will open the default address book app, such as Thunderbird or Outlook, and let you add a new contact. hCard, on the other hand, is a microformat, which means that third party applications can use the data, too. \nFurthermore, users' privacy settings are incorporated in the hCards and vCards. Each user can choose if they want to share their email address and phone number with everyone or their contacts only. \nIf you're lost on the concept of hCard, and are interested in all this dataportability/microformats stuff, you can start with Operator, a Firefox extension for handling several microformats including the hCard."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2008/04/24/mybloglog-address-book/>