Facebook has unveiled its “Places” functionality that allows users to share their location and find their friends. When you arrive at a place and check in, you can tag friends who are with you and post their location to Facebook.
Privacy advocates have raised flags, saying that no one can be checked in a location without their explicit permission.
The feature is now working in the new iPhone Facebook app and in Touch.Facebook.com for advanced mobile browsers (I used it while on vacation in Spain; see the screenshot above).
It is expected that Facebook will generate massive location-based status updates. And when Facebook incorporates proximity advertising, it will generate a new era of local advertising.