SAN FRANCISCO--Nestled inside the badges that were handed to attendees at Facebook's F8 developer conference here on Wednesday were what looked like little paper dog tags emblazoned with Facebook's logo. These are part of something calls "Facebook Presence," which at this point is little more than a gimmick for the hordes of techies here.
But it calls up the possibility that when Facebook finally makes a concrete move into the hot "geolocation" space, it may look something like this.
Here's how the RFID-enabled "Presence" works. The tokens contains a number, which … Read more