Today at Facebook’s f8 conference in San Francisco, the company have given all attendees a small RFID tag attached to their conference badge. This tag is a part of something called “Facebook Presence” which allows you to “check-in” at various places around the conference simply by swiping your badge. Yes, it’s location. This is actually the same thing Facebook uses for its infamous keg bot at its
![Facebook Presence: Location At f8 Through RFID | TechCrunch](https://cdn-ak-scissors.b.st-hatena.com/image/square/a22dd53e3fc8ad30dc5f250bd254943c78250d7b/height=288;version=1;width=512/https%3A%2F%2Ftechcrunch.com%2Fwp-content%2Fuploads%2F2010%2F04%2Ff8p.png)