Facebook Places API Ready for Platform Developers
What this means is that developers will have access to Facebook user's check-ins, that is, when they last engaged with Facebook features, and even when a user's friends check-in to the social networking giant. The "write" functionality means that they won't be able to enable an app to sign them in (hence, "check-in").
Even with the restrictions, developers will be able to create games, event tools, travel and local commerce apps with new functionality. These location-powered applications will continue to change the face of social networking, and will facilitate new functionality that will be effective for developers and advertisers.