How is this any different from just having your phone number displayed on your car window? Its the same thing – a special set of encoded information that tells another person how to get a hold of you?

As for Microsoft Tag itself, this is just another example of how Microsoft refuses to use existing standards that are proven to work just fine and think there’s a need that a proprietary system they create will fulfill. They need to stop doing this crap and just use their power to help leverage already existing “standards” into the spotlight as opposed to creating crap that no one will use and will confuse the masses to the point of forgetting a technology exists.