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Google and Foursquare offer NFC check-ins at I/O event
By Sarah Clark
• nfcworld.com • 9 May 2011, 23:08
Delegates attending the Google I/O developer conference in California this week will be able to check in to Foursquare using NFC phones.

FOURSQUARE: Devs invited to check in at conference to earn a Google I/O badge
According to the Foursquare blog:
We think a lot about the future of location, and, every time a new technology comes along, we think about how it affects what we're doing. Near-field communication (NFC) is one of those technologies; you tap your phone against a marker and it can check you in with foursquare. We've been testing it in our office for a little while and now we're expanding the test a little bit for Google I/O.
Google I/O is the big annual developer conference in California. This year, Google worked with us to put NFC check-in points all over the convention center. Starting tomorrow, just tap your NFC-enabled phone (most newer Android devices have it) against the poster, it'll check you in with foursquare, and you'll get a special Google I/O badge. For those without NFC, you can also scan the QR code on the poster itself.
NFC is, obviously, a long way from being available everywhere and in all phones, but we're excited by some of the potential. Google I/O attendees: have fun tapping in.
Foursquare revealed it was testing NFC internally in March this year.
• The first day of Google I/O, Tuesday 10 May, features a session called How to NFC at 15:45 PST. The event is sold out, but the session will be streamed live over the internet.
A word from NFC World's publisher:

Get the latest thinking on the current state of play and the future of the market. The NFC Market 2012, our new research report, is available now for delivery today.

If you want to create your own NFC checkin tags and checkin with a simple tap, you should check out my nfc checkin app: https://market.android.com/details?id=de.flavor.fsnfc
The app also links to a nfc shop where you can buy suitable tags to get you started.