The mobile world has led to many positive developments, but has left
people difficult to find.  Is Fred working from home, in the
conference room, sitting at a hot desk, in the gym, or at the local
coffee shop?  Mobility gives people freedom to move, but you need to
know where to be found without endlessly letting people know.

Making people carry RFID badges, or an extra transmitting device is
just too much effort. A Bluetooth phone or PDA is something everyone
has to carry anyway, and with its unique address it can be used for
identification.

FOAF is an emerging convention for personal data in RDF/XML and being
RDF, it can easily be extended, extending it for Bluetooth id allows
us to integrate identity information with other personal details,
freeing people from having to maintain separate data.

Controlling the access to the location data is an important
consideration, the private nature of so much of the FOAF information
has led to development of techniques for ensuring only the right
people get the data. This allows us to ensure that only your friends
know when you're in the bar, and your colleagues when your at the
merger meeting.

Virtual life has also led to becoming friends with people you won't
recognise, Bluetooth can alert you to their presence as you pass them
in an airport, or at a conference.  It could also end the need for a
red-rose or a rolled up copy of the Times, when meeting that blind
date.

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The mobile world has led to many positive developments, you have
freedom to move, but can you be found? Bluetooth phones, and PDAs
allow you to let others know where you are with only simple detectors,
and the internet.  A distributed system based on FOAF, an RDF/XML
vocabulary for people, allows users to control all their own data,
whilst still working everywhere.